• RELEVANCY SCORE 4.46

    DB:4.46:Msa 2000fc Vsphere And Round Robin 3j




    I have a number of MSA 2212fc G1 and MSA 2312fc G2 storage arrays conected to 4 hosts I'm planning to upgrade from ESXi 3.5 to vsphere 4.0. They all have dual controllers and are running as active/active using fixed path. The licenses have been upgraded as part of support agreement and therefore will be Enterprise licenses (as opposed to enterprise plus)

    Can I use round robin on vsphere 4 with this setup to provide better load balancing across the 2 SAN fabrics? Has anyone else used round robin with this type of storage? I'm slightly concerned doing this with the MSA212fc G1's as they don't do true active/active.

    DB:4.46:Msa 2000fc Vsphere And Round Robin 3j

    Hi,

    The VMware Compatibilty Guide indicates the path policy should be fixed so unless HP directs you to do otherwise it would not be supported.

    Regards,

    Mike

    http://blog.laspina.ca/

    http://blog.laspina.ca/

    vExpert 2009

  • RELEVANCY SCORE 3.15

    DB:3.15:For Those With Msa 23xxi Or Msa 2000i Sans c1





    Relates to anyone with a G1 or G2 model of the MSA2000 (with dual controllers)...

    I see alot of conflicting information on setting up iSCSI in vSphere and NO official document from HP?

    I am curious. If you have a MSA 2000i or MSA 23xxi with vSphere...

    1. Do you have ESX setup with a) 1 vSwitch and 2 VMKernels (and 2 pNICs on that vSwitch), or do you have, b) 2 vSwitches each with 1 VMKernel (and 1 pNIC on each vSwitch)?? The iSCSI config document from VMWare for vSphere lists BOTH as possible config options around page 32 (I think.. from memory).

    2. Are you using Fixed model, MRU (Most Recently Used), or Round Robin?

    Just curious how others have this setup... Thanks.

    JR

    DB:3.15:For Those With Msa 23xxi Or Msa 2000i Sans c1


    Hi Jason,

    Sorry for posting my question on this old post. I already posted my question but no response.

    Here is my question

    I have configured my MSA2312i and can see all the luns on ESXi 4.1. But unable to see the lun on my secondary esxi host

    Site A

    ESXi host

    VMk1 (iSCSI) - 10.1.1.50

    Internal cisco switch : 10.1.1.x

    HP MSA2312i ( physically located at Site A)

    Management IP: 192.168.23.169

    Port A (iSCSI); 10.1.1.55 , 255.255.255.0 , 0.0.0.0 ------- Connected to internal Switch

    Port B (iSCSI); 192.168.23.170 , 255.255.255.0 , 0.0.0.0----- Connected to CISCO switch

    I can see the luns only if I add 10.1.1.55 via static discovery on Site A.Unable to see the luns on 192.168.23.170 via static discovery or dynamic discovery.

    We have EMC storage configured which works fine with out any problems.

    Any help or advise is appreciated.

    Thanks

    SA

  • RELEVANCY SCORE 2.87

    DB:2.87:Switch To Round Robin jz





    Hello Folks,

    I am a bit confused. I have my storage (EMC CX) set to failover mode 4, rebooted host and now see they are set as VMW_SATP_ALUA_CX. I believe now, I can go to each datastore and change the path selection to "Round Robin (VMware)". I do a lot of MSCS, and noticed that Round Robin is not supported with MCSC. I found the below from VMware. It states Round Robin PSP is not supported for luns mapped by RDM, but then there is a "note" that says with NMP, clustering is not supported when set to Round Robin. This is my confusion, isnt the the note repeating exactly what it says right above it, or am I not getting something? Also, I'm running 5.0, is there any other changes I need to make in order to get this to work?

    Path Selection Policy (PSP)

    Round Robin PSP is not supported for LUNs mapped by RDMs used with shared storage clustering. If you chose to use Round Robin PSP with your storage arrays, or if the vSphere version in use defaults to Round Robin PSP for the array in use, you may change the PSP claiming the above RDM LUNs to another PSP. For more information, see Changing a LUN to use a different Path Selection Policy (PSP) (1036189).

    Note: With native multipathing (NMP), clustering is not supported when the path policy is set to Round Robin. For more information, see vSphere MSCS Setup Limitations in the Setup for Failover Clustering and Microsoft Cluster Service guide for ESXi/ESX 4.x or ESXi 5.x.

    Any help would be great. This confuses me

    -MN

    DB:2.87:Switch To Round Robin jz


    Thanks Matt.

    I wasn't sure if there was something I had to configure afterwards to make use of multiple paths

  • RELEVANCY SCORE 2.85

    DB:2.85:Thread: Dns Round Robin cd


    Can you do round robin DNS with Netware 6.5?

    DB:2.85:Thread: Dns Round Robin cd

    How can I assign multiple IP addresses to a single hostname? I am unable to do this using DNSDHCP Console, can you please clarify?






    Originally Posted by Brad Doster


    AFAIK, it should work like 6.0 in which case it does it automatically

    when you assign multiple IP addresses to a single host name.

    bd

    NSC Volunteer SysOp

  • RELEVANCY SCORE 2.80

    DB:2.80:Question On Round Robin cz


    When round robin is implimented in storage, at a given instance how many paths will be active ?

    DB:2.80:Question On Round Robin cz

    Round Robin is an experimental feature of ESX 3.5 (see page 94 of Fibre Channel SAN Configuration Guide).

    But also without this feature if you have some LUNs (or Storage Volumes) you can use different path for each LUN.

    This mean that you can indirectly "balance" the storage I/O.

    Andrea

    **if you found this or any other answer useful please consider allocating points for helpful or correct answers

  • RELEVANCY SCORE 2.78

    DB:2.78:Advantages And Disadvantages Of Using Adaptive Dispatch Mode Over Round Robin Method jx



    Hi,

    We have analyzed the different types of dispatch modes and are planning to use adaptive dispatch mode in our environment. Please let me know the advantages and disadvantages of using adaptive method over round robin method.

    Thanks, Antony Praveen Raj

    DB:2.78:Advantages And Disadvantages Of Using Adaptive Dispatch Mode Over Round Robin Method jx


    Hi,

    We have analyzed the different types of dispatch modes and are planning to use adaptive dispatch mode in our environment. Please let me know the advantages and disadvantages of using adaptive method over round robin method.

    Thanks, Antony Praveen Raj

  • RELEVANCY SCORE 2.78

    DB:2.78:Round Robin Partition ?? kf



    Hi ,

    I am trying round robin partition type in my sample mapping,which is like:

    flat file soure expression Tx flat file target

    I have created three partitons in the mapping.The partition type is as follows:

    1. Pass through at source

    2. Round robin at exp

    3. Pass through at target.

    I have given the file name for first partition only,for other partitions the field is blank.

    As per round robin type my incoming rows from source should get equally distributed between the 3 partitions,but thats not happening and

    all the rows from source are going to the first partition.

    Please help.

    Regards,

    Rakesh

    DB:2.78:Round Robin Partition ?? kf


    Download the solution and go through the user guide from my above post. You will get idea.

  • RELEVANCY SCORE 2.77

    DB:2.77:Round Robin Path Policy ax



    Currently i have to go to Manage Path and change the path to round robin manually when the new volume is presented from my storage. Any way to set round robin policy as default on all my volumes when they are added?

  • RELEVANCY SCORE 2.73

    DB:2.73:Dns Round Robin ak


    I would like to use DNS round robin on 2008 R2 for two web servers, same hostname butdifferent IP addresses. Is there any way to know how the DNS server maintains/knows about round robin requests?
    For example the first request will be pointed to IP-1 and the second request to IP-2.
    Is there any way to know this information?

    DB:2.73:Dns Round Robin ak

    Hi,
    Thank you for the post.
    Round robin is not a perfect load balancing mechanism. It just rotates it based on client queries.
    By default, Windows Vista and Windows 2008 clients do not honor DNS round robin mechanism.
    http://blogs.technet.com/b/networking/archive/2009/04/17/dns-round-robin-and-destination-ip-address-selection.aspx
    If there are more inquiries on this issue, please feel free to let us know.
    RegardsRick Tan
    TechNet Community Support

  • RELEVANCY SCORE 2.67

    DB:2.67:Round Robin Algorithm... jx



    Hi all,

    I have a cat 6509 switch and I'd like to use etherchannel to multiple bandwidth and want to use round robin load balancing algorithm.

    Is that possible ?

    Thanks in advacne..

    DB:2.67:Round Robin Algorithm... jx


    Don't believe so , it is based on either the source or destination mac address or source or destination ip address depending on how you setup that parameter which in most cases is more than adequate to get fairly even utilization across both links.

  • RELEVANCY SCORE 2.66

    DB:2.66:Mru Policy Showing Up For Eva6000 sa



    I have installed vSphere Update 1 onto a couple of new hosts.

    When I attach them to my EVA6000 the policy of the path is defaulting to Most Recently Used and it's confusing to me a little because when I connected my ESX 3.5 servers to the same EVA6000 the policy defaulted to Fixed as I understand it should on an active/active array.

    I got nervous so I set them all to Fixed.

    The Storage Adapter Type that I see is VMW_SATP_ALUA. Should I be concerned about this?

    Also would there be any benefit to running the paths under Round Robin now that it is fully supported under vSphere?

    Will my EVA freak out if I set the vSphere host paths to round robin while the ESX3.5 hosts are still set to fixed?

    DB:2.66:Mru Policy Showing Up For Eva6000 sa


    vSphere Update 2 maybe fix this issue, thanks

    binoche, VMware VCP, Cisco CCNA

  • RELEVANCY SCORE 2.66

    DB:2.66:Vlan Pooling - Hash Vs Round Robin 77



    Wondering if anyone is using the new round robin feature for user vlan distribution, and can comment on benefits and drawbacks versus the static hashing algorithm method.

    We are upgrading our M3s soon and could definitely use this feature if there are not too many negatives.

    Thanks!

    Marcelo




    Marcelo LewWireless Network Architect-EngineerUniversity of Denver

    DB:2.66:Vlan Pooling - Hash Vs Round Robin 77


    Nik,

    Regardless of how many ip VLANs you dedicate, there will always be a certain number of unused ip addresses, so that you do not run out. VLAN pooling's main benefit is to keep you from having to completely restructure a subnet, by just adding a VLAN you can expand capacity.

    With that being said, the "waste" is specific to your environment. Not only does it depend on space, it also depends on the length on your DHCP scopes. You need to experiment to determine the happy medium in your own environment. You could ideally use a single subnet sized to your needs and be done with it.

    EDIT: Please see if the post here: https://arubanetworkskb.secure.force.com/pkb/artic​les/FAQ/What-is-even-vlan-pooling-and-how-is-it-be​tter-than-the-previous-Hash-based-VLAN-pooling-mec​hanism answers your question...




    Colin JosephAruba Customer EngineeringLooking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

  • RELEVANCY SCORE 2.65

    DB:2.65:Round Robin 8j


    Can someone tell me what "Round Robin" means?

    Johannes

    DB:2.65:Round Robin 8j

    round robin means. One by one..It can be bound with with time slices or with task finish.

    Shaan

  • RELEVANCY SCORE 2.65

    DB:2.65:So Confused About Vsphere Round-Robin Iscsi Multipathing... 9d



    Hi all,

    Hope any of the gurus on this community can help clarify something for me...

    Essentially I would like to know if it's possible to do vSphere iSCSI NMP with only 2 NIC's per FAS node and without stack capable switches (i.e no cross-switch etherchannel)?

    Hypothetical Example:

    In this case the core switches don't support any kind of stacking at all, and therein lies the problem.
    I know that because of this and if I want a minimum of safety (redundancy) I have to connect each of the 2 NIC's on the FAS node to the 2 Switches.

    Example:


    Now, I know that in this configuration I only have failover capacity between each NIC on the FAS nodes. But that’s just it, I would like to know if it’s possible using this setup to have multipathing iSCSI using round-robin NMP on vSphere.

    Let’s say I configure 2 vmKernel NICS on one ESX vSwitch using IP’s from our example Lan (IP 10.10.0.6 and 10.10.0.7). Bearing in mind that the 2 NICs on the vSphere will be connected in a manner similar to the FAS nodes, one cable to each of the 2 switches.
    Now, if I specify round-robin on the 2 vmKernel NIC’s and then use the VIF’s as iSCSI targets, will I get multi-pathing to each node? That is, will the vSphere NMP automatically balance the paths?

    Or, do I have to create 1 VIF alias on each node (as suggested by the “vSphere SAN Configuration Guide”) and then use those 4 VIF’s as iSCSI targets?

    Confused? You bet

    Thanks in advance

    Kind Regards,

    DB:2.65:So Confused About Vsphere Round-Robin Iscsi Multipathing... 9d


    Ho boy, I just realized who you are, this is indeed an honor Sir.

    Many thanks Vaughn, this really clarifies a lot of my (wrong) preconceptions...

    Alass, I don't fully understand one of your answers:

    "-- NO -- Controller failover is in ONTAP and each single link has a failover partner defined within the array. (...)"

    When you mention failover partner are you referring to the other node and it's capability to assume the failed node identity?

    Or, are you refering to some internal mechanism of Ontap that allows a surviving NIC (even without VIF configuration) to assume the IP of the downed interface (i.e the IP of e0 is assured by e1)?

    To be quite honest I find tr-3749 somewhat confusing, it has sections that are quite clear but others throw me off completely... For instance, whenever there are examples of multi-pathing without some sort of cross-switch etherchannel, the guide always suggests using different subnets on the FAS NIC's and has you have demonstrated on this thread, that isn't always the case...

    Cheers and thank you again

  • RELEVANCY SCORE 2.65

    DB:2.65:Round Robin Support af


    Hi,

    Does anyone know when round robin load balancing will be fully supported for production?

    Thanks.

    DB:2.65:Round Robin Support af

    Hi,

    Does anyone know when round robin load balancing will be fully supported for production?

    Thanks.

  • RELEVANCY SCORE 2.62

    DB:2.62:Setting Up Alua On Cx4 kk



    Hey All,

    I am currently in the process of researching how to setup out CX4-120 and VMware vSphere 4.1 environment to take advantage of ALUA and using round robin for our storage. I have read through the EMC documentation (EMC CLARiiON Integration with VMware ESX and Using EMC CLARiiON Storage with VMware vSphere) as well as Jason Boche's great blog post about setting it up. What I am questioning is this our production environement and am curious what (if any) could the impact be as I go server to server to change the failover mode via Navisphere, configure the SATP to use Round Robin, and switch the path selection policy on a LUN to servers that can access that same LUN but have yet to be configured?

    TIA,

    -Jason

    DB:2.62:Setting Up Alua On Cx4 kk


    Hi Jason,

    In order to set ALUA on a CX/VNX system, you simply need to set the failovermode to 4

    im attaching a document that shows how to do it and talks about ALUA in general.(FLARE 29 but it's similiar in FLARE 30)

    once you set your array to ALUA (FLARE 29 and above), you probably want to use RR as well or even better than this, EMC PowerPath/VE as it's the only component that will allow a lun trespassing failback to it's original SP Owner, not to mention the superior Load Balancing PowerPath/VE will do to your enviornment.

    also, you will need to reboot your ESX in order for it to properly work, there shouldnt be any negative effect on the ESX Servers you havent set ALUA on yet.

    Itzik Reich

    vSpecialist Technical, EMEA

    VCI,VCP4,3,VTSP4,MCTS,MCITP,MCSE,CCA,CCNA

    EMC Computer Systems Israel

  • RELEVANCY SCORE 2.61

    DB:2.61:Thread: Round Robin jx


    how do i enable this

    DB:2.61:Thread: Round Robin jx

    Yep. Apparently you had more time than I... g

    Nice tag line! :-)

    bd

    NSC Volunteer SysOp

  • RELEVANCY SCORE 2.58

    DB:2.58:Aggregation Ports And Round Robin Balancing On Switches kd



    Hello,

    I looking for round robin options and i don't see it. I looking this on others vendors and also there isn't round robin algoritm. On Linux boxes it's working fine.

    I have problem when i have 2x1G aggregate interfaces and only two speaking servers. All traffic go through one pipe. There is some problem with round robin on switches ? There are some models with this options ?

    thanks for help

    greetings

    Peter

    DB:2.58:Aggregation Ports And Round Robin Balancing On Switches kd


    On Linux box i have to use mode 0 because there is only the one with round robin balancing. All works ok when linux box is transmiting through two ports. Problem is in opposite direction when switch is transmiting - all traffic is going via one port. What exactly problem is with reordered packets ? I don't see any problem when Linux box is transmiting packets.

  • RELEVANCY SCORE 2.57

    DB:2.57:Whats New And Improved In 3.5 kz



    Here is the link that provides details of what is new and improved in VI3 version 3.5

    http://www.vmware.com/support/vi3/doc/whatsnew_esx35_vc25.html

    Notice the new experimental support for Round Robin load balancing that a few of you were talking about.

    Round-robin load balancing (experimental)ESX Server 3.5 enhances native load balancing by providing experimental support for round-robin load balancing of HBAs. Round-robin load balancing can be configured to switch paths to the SAN based on the number of I/Os or megabytes sent down a given path between path switches. This feature can be enabled with default settings via the VI Client. While round-robin load balancing can be selected through VirtualCenter, only default configuration options are available. More advanced options are available via the CLI. For more information on using this feature, see the Round-Robin Load Balancing document.

    DB:2.57:Whats New And Improved In 3.5 kz


    Here is the link that provides details of what is new and improved in VI3 version 3.5

    http://www.vmware.com/support/vi3/doc/whatsnew_esx35_vc25.html

    Notice the new experimental support for Round Robin load balancing that a few of you were talking about.

    Round-robin load balancing (experimental)ESX Server 3.5 enhances native load balancing by providing experimental support for round-robin load balancing of HBAs. Round-robin load balancing can be configured to switch paths to the SAN based on the number of I/Os or megabytes sent down a given path between path switches. This feature can be enabled with default settings via the VI Client. While round-robin load balancing can be selected through VirtualCenter, only default configuration options are available. More advanced options are available via the CLI. For more information on using this feature, see the Round-Robin Load Balancing document.

  • RELEVANCY SCORE 2.56

    DB:2.56:Round-Robin Issue In Weblogic Cluster 81


    Hi,
    We are having two weblogic clusters with two managed servers in each cluster.

    On cluster one (C1) we have deployed a EAR which hosts web service and consumes another web service.

    On cluster two (C2) we have deployed a EAR which hosts web service consumed by C1.

    We have round-robin setup for both clusters and HTTP session replication is enabled for our EARs (using weblogic.xml). Front end for C1 is our iPlanet webserver and front end for C2 is Weblogic Proxy ('weblogic.servlet.proxy.HttpClusterServlet').

    The Setup works like:
    User -- iPlanet -- C1 -- Weblogic Proxy -- C2

    The issue we're facing now is round-robin and HTTP session replication works in C1 BUT in C2 only HTTP session replication works. Round-robin doesn't work in C2 meaning, request always hits only one server in C2.

    Can any one please shed some light on why 'round-robin' doesn't happen in C2?

    Thank You,
    Ravi

    DB:2.56:Round-Robin Issue In Weblogic Cluster 81

    From the proxy log file, I can see the round-robin policy works fine and as you can see:

    Tue Mar 22 11:38:28 EDT 2011 [ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)': ===New Request===GET /services/core/ObjectService?WSDL HTTP/1.1
    Tue Mar 22 11:38:28 EDT 2011 [ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)': #### Trying to connect with server nj09mhf5032!30222!443

    Tue Mar 22 11:38:29 EDT 2011 [ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)': ===New Request===GET /services/core/runtime/AgentService.rest?method=getDeploymentId HTTP/1.1
    Tue Mar 22 11:38:29 EDT 2011 [ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)': #### Trying to connect with server 830568629!nj09mhf5036!30224!-1

    Tue Mar 22 11:38:29 EDT 2011 [ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)': ===New Request===POST /services/core/ObjectService HTTP/1.1
    Tue Mar 22 11:38:29 EDT 2011 [ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)': Found cookie: 830568629!1124194698
    Tue Mar 22 11:38:29 EDT 2011 [ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)': #### Trying to connect to the primary server:830568629!nj09mhf5036!30224!-1

    the first request was dispatched to server: nj09mhf5032!30222! and the second request was sent to nj09mhf5036!30224. For the third request, as the session info was found, it's sticked to server: nj09mhf5036!30224!. It works as design, but not a problem to WLS. When session info was found, the request would be resent to the server where the session was created primiarily, but not to a server that selected based on round-robin.

    When DisableCookie2Server is set to true, cookie from browser will be ignored,i.e., when the third request come into proxy server, Session info will be ingored, so the request will be sent to a server based on round-robin, but it's not a good behavior!

    By the way, do you mean the second and the third request originated from different browser? If so, it's a little strange except that you open a new window or tab from the second request window to send the third request! Anyway, as you can see, the cookie is detected by proxy server, i.e., it's sent by the third request window.

    Edited by: Fenghua Jin on Mar 22, 2011 7:08 PM

    Edited by: Fenghua Jin on Mar 22, 2011 7:09 PM

  • RELEVANCY SCORE 2.56

    DB:2.56:Powercli, Change Pathing: Rdms To Fixed And Vmfs To Round Robin m7



    With the new improvements to vSphere native mulit pathing (NMP) in 5.1 I wanted to change all my LUNS to use Round Robin as per the new EMC best practice with my VNX flare code.

    However I also have MSCS clusters which only support Fixed mode as per http://kb.vmware.com/kb/1037959.

    Subsequently I want to get all my VMFS volumes and set them to Round Robin, and leave all my RDMs set to Fixed.

    I am hoping to do this dynamically so I can leave it with the admin here to run whenever he wants, but I am struggling to get this done.

    What Ive tried so far.

    I can get all my LUNs with these command.

    $esxcli = Get-EsxCli

    $Allmyluns = Get-esxcli.storage.nmp.device.list() | Where {$_.device -like "naa.*"}

    I can get all my RDMs with this command

    $RDMS = get-vm | get-harddisk | where {$_.SCSIcanonicalname like naa.* | select SCSIcanonicalname

    I can set the method once I have the storage by doing this

    $esxcli = Get-EsxCli

    Foreach ($lun in $allmyluns({

    $esxcli.nmp.device.setpolicy($null, $_.Name, "VMW_PSP_RR")

    }

    I have also thought about writing a csv or text file with the first command and trying to remove the entries with the second command but that is a bit past me, and I may be trying to over-complicate things unnecessarily.

    But what I cant do is work out how to get a list whenever I want that has all the VMFS LUNS but not any of the RDM LUNS. So I can dynamically feed this into a script which updates VMFS pathing to Round Robin.

    Any help, input or ideas would be greatly appreciated

    DB:2.56:Powercli, Change Pathing: Rdms To Fixed And Vmfs To Round Robin m7


    I could also do it with the EMC VSI if i wanted to change ALL to round robin but then my ms cluster vms would go to round robin and that would be BAD as they then go into flap and the clusters fail and that is why they are unsupported on round robin. Hence the post. Thanks though.

    Also thankyou for some of the syntax in the variables above, they got used, much appreciated.

  • RELEVANCY SCORE 2.56

    DB:2.56:Round Robin Tournament 91


    Hi,

  • RELEVANCY SCORE 2.56

    DB:2.56:Netapp And Mpio 79


    I have a question about ALUA and Round Robin.

    I am using a NetApp 3140 in an active\active configuration for a SAN. The NetApp is configured to use FCP. All ESX hosts are vSphere 4.0. The NMP was set to Fixed on the ESX servers. The hosts saw four paths to each LUN. 2 paths for the active controller and 2 path for the partner.

    I then enabled ALUA on the NetApp and igroups. I set the ESX system default PSP for VMware Default ALUA SATP to use the Round Robin PSP. The ESX host only see 2 paths to the LUNs. Is this correct?

    DB:2.56:Netapp And Mpio 79


    esxcli nmp path list showed the two paths on the second controller as dead. I did a rescan on the hba and it discovered the other two path on the second controller. I didn't think it could be such a simple solution!

  • RELEVANCY SCORE 2.56

    DB:2.56:Round Robin Psp pc



    is there anyone who can tell me how many paths are used by the round robin PSP simultaneously?

    DB:2.56:Round Robin Psp pc


    The default behavior with Round Robin is to send down 1000 IOs down a path before switching to the next one.

    This article contains some testing with IOs set to 1.

    http://jpaul.me/?p=2492

  • RELEVANCY SCORE 2.56

    DB:2.56:Vsphere 5.1 And Emc Storage Multipathing p9



    vSphere 5.1 and EMC Storage Multipathing

    kb.vmware.com/kb/2034799 Load balancing using Round Robin multipathing policy on EMC VNX arrays on vSphere 5.1kb.vmware.com/kb/2034797 Load balancing using Round Robin multipathing policy on EMC Symmetrix arrays on vSphere 5.1PowerPath/VE fails to load on vSphere 5.1 kb.vmware.com/kb/2034796 VMware and EMC have identified two issues with PowerPath/VE 5.7 and VMware vSphere 5.1.

    Any idead of the following:

    MSCS Configurations - Storage devices managed by the VMW_PSP_RR policy might result in unsupported configurations. For more information, see the VMware Knowledge Base article 2033122.

    DB:2.56:Vsphere 5.1 And Emc Storage Multipathing p9


    vSphere 5.1 and EMC Storage Multipathing

    kb.vmware.com/kb/2034799 Load balancing using Round Robin multipathing policy on EMC VNX arrays on vSphere 5.1kb.vmware.com/kb/2034797 Load balancing using Round Robin multipathing policy on EMC Symmetrix arrays on vSphere 5.1PowerPath/VE fails to load on vSphere 5.1 kb.vmware.com/kb/2034796 VMware and EMC have identified two issues with PowerPath/VE 5.7 and VMware vSphere 5.1.

    Any idead of the following:

    MSCS Configurations - Storage devices managed by the VMW_PSP_RR policy might result in unsupported configurations. For more information, see the VMware Knowledge Base article 2033122.

  • RELEVANCY SCORE 2.56

    DB:2.56:Vsphere 4 And Round Robin Multi-Pathing For Hitachi Universal Storage Platform Family dm



    Hi Friends,

    What's the suggest value for the IOPS when using the Round Robin policy for the USP (Hitachi Universal Storage Platform Family ) Storage?

    esxcli nmp roundrobin setconfig --type iops --iops 1 --device $dev;

    and what the default value for the ESXi Server 4?

    Thanks.

    DB:2.56:Vsphere 4 And Round Robin Multi-Pathing For Hitachi Universal Storage Platform Family dm


    The default value is 1000.

    You'd likely need to ask Hitachi for their recommendation on IOPS as they are array independent.

    HP do see benefit with IOPS=1 but I haven't seen many other vendors recommend changing it.

  • RELEVANCY SCORE 2.55

    DB:2.55:Unofficial Round Robin Functionality Thread ff



    If you have tried round robin multipathing on your VI deployment, please add your array and relevant info to this spread sheet:

    http://spreadsheets.google.com/ccc?key=pyLDRue7X2ugIhubUzLd9Eg

    --Matt

    DB:2.55:Unofficial Round Robin Functionality Thread ff


    Updated Matt....Worked well on the new production test (I'd tested before, but non-production). I modified the header so that we can include the month/year we started testing the platform. 3 months doesn't do us much good if it was last year and we ended up killing it.

  • RELEVANCY SCORE 2.54

    DB:2.54:Vsphere Network Config To Support Ax4-5i Iscsi Multipathing? d3



    Hi All,

    I'm having trouble obtaining the recommended vSwitch configuration in VMWare vSphere 4 (update 1) to support iSCSI multipathing with our dual SP AX4-5i.

    Specifically:1) Do we need to setup 1 or 2 vmkernal ports for iSCSI storage on the vSwitches?2) If 2, should they be setup on separate distinct networks corresponding to each of the storage processors?3) What type of load balancing algorithm (NIC Teaming) should be used on the vSwitch (port bases / ip-hash / MAC) and can/should uplinks be configured as Active/Standby or Active/Not Used?4) Should Round Robin or MRU (most recently used) be utilised for pathing against each LUN?

    There seems to be conflicting documentation / articles / blogs on this issue, not least of which is that most doco was written against ESX 3.x while the vSphere 4 seems to offer additional options in this area (rond-robin), as well as Update 1 which reportedly fixes some further known issues. Additionally the configuration seems to change based on different models of EMC-SAN's which I'm guessing correlates to whether the SAN is an Active/Active or Active/Passive device.

    Our environment:- AX4-5i, dual processor with additional DAE- 2 x HP DL380 G6 servers with 8 physical NICS each- 2 x HP Procurve 2910al-48G gigabit switches configured with dedicated VLAN(S) for ISCSI storage- vSphere enterprise plus licensing (so distributed switched are available)

    Any help appreciated,Thanks,

    Andrew

    DB:2.54:Vsphere Network Config To Support Ax4-5i Iscsi Multipathing? d3


    Hi Folks,

    I wrote the support article emc156408, so I thought I'd see if I could shed some light here.

    The issue that many run into with LUN mapping and shared storage on ESX, is that ESX recognises each virtual disk, based on its Host Logical Unit Number (HLU). The CLARiiON storage-group (or the server LUN assignment on the AX) will map each HLU (starting from 0) to an Array Logical Unit Number (ALU, which is the number of each LUN in Navisphere), is the order they are added into the Storage-group, or assigned to a host.

    Normally this is not an issue on Navisphere, because all the ESX servers can be added into a single Storage-group and will therefore have the same HLU. If multiple Storage-groups are used for ESX, more care needs to be taken for all the LUNs to make sure each ALU has the same HLU in each Storage-group.

    The AX4-5 GUI was designed to simplify adding unique LUNs to each server, rather than complex LUN sharing configurations. Therefore getting the HLU to match in Navisphere Express is more difficult.

    It can be done by making all the shared ESX Storage-group at the same time and adding in the LUNs in the same order. An easier option though, would be to upgrade Navisphere Express to the full version of Navisphere

    Regards, Dave Reed

  • RELEVANCY SCORE 2.54

    DB:2.54:Issues With Vmkfstools -I. Help To Convert A Vmdk To A Rdm. c8



    I am trying to convert a 675GB .vmdk to an RDM on an EqualLogic iSCSI LUN that is 750GB. I was successful previously on ESX3.5 but now I am on vSphere (ESX 4.0) and having no luck.

    I have VMware Round Robin Multipathing setup and am using the VMware Software Initiator for connectivity to the SAN. I have tried using a LUN that did not have Round Robin enabled and still had no luck.

    Command:

    vmkfstools -i /vmfs/volumes/SRS-Restore/CCSRS/CCSRS_2.vmdk /vmfs/volumes/Datastore0/CCSRS/SRS_F_rdm.vmdk -d rdm:/vmfs/devices/disks/vmhba33:0:7:0

    Error:

    Destination disk format: raw disk mapping to '/vmfs/devices/disks/vmhba33:0:7:0'

    Cloning disk '/vmfs/volumes/SRS-Restore/CCSRS/CCSRS_2.vmdk'...

    Failed to clone disk : The destination file system does not support large files (12).

    DB:2.54:Issues With Vmkfstools -I. Help To Convert A Vmdk To A Rdm. c8

    Hello all,

    In response to CCJNL:

    The file that you are trying to clone is 675GB. What is your datastore block size ?

    Im refering to this part of the command ' /vmfs/volumes/Datastore0/CCSRS/SRS_F_rdm.vmdk' .Because is your block size is 1MB, then you are limited to creating a file of 256 Gb max size.

    In this case, you must delete the datastore, and add it again with a block size of 4 MB. ( 2MB block size is for 512 Gb max size)

  • RELEVANCY SCORE 2.53

    DB:2.53:Setting Round Robin As Default In Esxi5 ac



    Is there a way to set all targets to use Round Robin instead of having to manually go to each path under Configuration, Storage Adapters, and then manage paths?

    DB:2.53:Setting Round Robin As Default In Esxi5 ac


    You run it in vMA or vCLI. (http://www.vmware.com/support/developer/vima/index.html or http://www.vmware.com/support/developer/vcli/)

    We have the string "esxcli storage nmp satp set --satp VMW_SATP_EQL --default-psp=VMW_PSP_RR" (without the quotes) in our vMA script.

  • RELEVANCY SCORE 2.53

    DB:2.53:Fp 12 - Round Robin Assignment 9z



    Hi,

    Help needed,

    In FPSC 11.x we do able to do Round Robin assignment based on team and certain criteria.Ticket will be assign randomly to the members under the team. Anyone know how can it be done in FP12? Do understand that there is a Business rules - Auto Assignment, but how can we configure it to do round robin assignment?

    Thanks in advanced.

    Regards

    Tiff

  • RELEVANCY SCORE 2.53

    DB:2.53:Msa2012i -- Mru Or Round Robin, Which Is Better?? 8f



    We have an MSA2012i with our vSphere 4.x cluster and software iSCSI.

    It presently uses MRU, would anything be gained by changing this to round robin for each host/VM??

    I can test on 1 host / VM to start...

    Thank you, Tom

    DB:2.53:Msa2012i -- Mru Or Round Robin, Which Is Better?? 8f


    MRU is also OK when only one HBA, since you can add multi nics and port binding; and if you have multi luns on storage, you can still select different nics for different luns;

    round robin? I suggest to contact HP, for me, round robin maybe can not help for the performance here

    binoche, VMware VCP, Cisco CCNA

  • RELEVANCY SCORE 2.53

    DB:2.53:Ace Not Load-Balancing In Round-Robin Pattern After Server Rebooted jx



    Hi all,

    I have a pair of redundant Cisco 4710 ACE loadbalancer for performing L4 connection load balancing with 2 servers. It worked fine and the connection got load-balanced well in round-robin pattern, but after rebooting one of the server, I see the load-balancing is not like the rebooted server only gets 2 connection while another server get 10 connection. It is not performing in round-robin algorithm. Is it normal?

    I check the server status from ACE, it is in "INSERVICE" status.

    DB:2.53:Ace Not Load-Balancing In Round-Robin Pattern After Server Rebooted jx


    Hi Beng,

    This "might" be normal. take multiple show serverfarm detail output to show us the difference in the connection. If you have sticky configuration then this is expected behaviour because the sticky entry for the server which was not rebooted must be higher than then rebooted server. Also please share the show tech from the admin context so that we can see if there is anything else which can trigger this.

    Hope this helps

    Cheers

    V.K

  • RELEVANCY SCORE 2.52

    DB:2.52:Do We Need To Enable Alua For "Round Robin" Multipathing In Vsphere? a3



    We just migrated all data from CX3 to a CX4 SAN.

    If we would like to know "Round Robin" or "VMX_PSP_FIXED_AP" mutlipathing, do we need to get ALUA enabled ?

    Moreover, does "VMX_PSP_FIXED_AP" require "PowerPath for ESX" installed ?

    Thanks

    DB:2.52:Do We Need To Enable Alua For "Round Robin" Multipathing In Vsphere? a3


    The problem with FIXED is that you have to manually set the primary paths for every LUN on every Host in order to utilize all available paths and bandwidth. This is no different from MRU except that MRU doesnt go back to the primary path once it fails to a secondary path, so it becomes unbalanced over time, where FIXED goes back to the primary paths after the fabric heals.

    RR and PowerPath/VE on the other hand use all active paths all the time so you dont have to manage which paths are primary to balance the paths. RR is very rudimentary however.. For a given LUN, it sends a certain number of IOs (default is 1000 I believe) down one path, then that same number of IOs down the next path, etc in round robin fashion. You get no performance improvement for a single LUN per-se but you get more effective use of multiple paths when you have several or many LUNs. PowerPath/VE actively monitors all paths and directs IO down the best path for performance. If one path encounters congestion at the front end port, switch port, switch ISL, HBA, etc IOs are redirected down alternate paths. RR on the other hand does not react to performance problems and latency on one path will affect all IO to all LUNs.

  • RELEVANCY SCORE 2.51

    DB:2.51:Storage Ibm Ds3524 z9



    Hola chicos como estan??

    Tengo una duda, el administrador de Storage me dice que la cabina es Activa/Activa por la cual aceptaria Round Robin como politica de pasos en vsphere 4.1 , alguien tiene algun link que me confirme esto ??

    sdos.

    DB:2.51:Storage Ibm Ds3524 z9


    Hola Scaprix.

    Dentro de las especificaciones de la familia DS3500, esto es los modelos DS524 (24 discos internos) y DS3512 (doce discos internos)

    se inidca Dual active, hot-swappable controllers, adjnto link:

    http://www-03.ibm.com/systems/storage/disk/ds3500/specifications.html

    puedes revisar el IBM System Storage DS3500 Introduction and Implementation Guide especialmente lo referente a VMware ESX Server and DS3500 Storage Configuration, adjunto link:

    http://www.redbooks.ibm.com/abstracts/sg247914.html?Open

  • RELEVANCY SCORE 2.51

    DB:2.51:Vsphere 4.1 - Iscsi Round-Robin Multipath Access To Given Lun? 9x



    I have an HP guy telling me that he has been told that vSphere does not support round robin using iSCSI

    I think he said that you can select round robin as the PSP, but that if you have multiple vmkernels loaded and each assigned to it's own nic, that it will not actually make use of multiple paths to any given LUN

    I thought that was one of the major feature improvements of 4.1 iSCSI

    Am I confused?

    DB:2.51:Vsphere 4.1 - Iscsi Round-Robin Multipath Access To Given Lun? 9x


    vSphere 4.x has no issues with Round Robin on iSCSI.

    It is up to the hardware vendor to confirm whether Round Robin is supported on their array which is why you rarely see it in the HCL.

    Most Active-Active arrays will support Round Robin, and most ALUA based Active-Passive arrays will also support it.

    Just to be sure I'd check with HP to confirm this.

    The 1:1 mapping (1 x vmkernel port assigned with 1 x NIC) is VMware best practice for all software iSCSI configurations regardless on whether Round Robin is being used.

  • RELEVANCY SCORE 2.51

    DB:2.51:Microsoft Cluster (Mscs) And Round Robin Access To San 3a


    I'm about to create a Microsoft Cluster (MSCS) on vSphere - but in the Cluster Setup documents from VMware I see this under "vSphere MSCS Setup Limitations":

    With native multipathing (NMP), clustering is not supported when the path policy is set to round robin.

    I'm planning to create two VMs Running windows 2008 with system / shared disk on a FC SAN - The VMs would be located on the same VMware host so I would just use a shared VMDK (not RDM).

    Is the above limitation only relevant when using RDM - or also when using a Shared VMDK?

    DB:2.51:Microsoft Cluster (Mscs) And Round Robin Access To San 3a


    Absolutely! I`ll be flad to help you in any possible way - email me to tobias.kracht@starwindsoftware.com

    StarWind Software RD

  • RELEVANCY SCORE 2.51

    DB:2.51:Vmware Round-Robin Multipathing Mixed With Last-Used On Clariion. z7



    VMware people:

    This is a VMware question from a Storage Guy.

    We recently stood up a SQL Server VMware Farm connected to a CLARiiON array. Each ESX Server has 2 x HBAs to the SAN, so that they see 4 x "paths" to the Array (2 paths on each HBA / fabric).

    They SQL Server VMware Farm hosts multiple SQL Server "Clusters" on multiple ESX hosts running vSphere 5.1. MicroSoft Clustering on vSphere 5.1 requires that you use RDM as Cluster Disks, and furthermore you must access them with "fixed" ESX multipathing, whatever that's called. It has SCSI interlock implicaitons. If they were running vSphere 5.5, they could use VMFS files for Microsoft Cluster cluster disks.

    So, they designed the entire VMware Farm to use all RDMs for All data volumes. (C: and D: drives of individual instances are VMFS.) And they ALL use "fixed" or "last-used" multipathing. The end result is that they beat up on one path on one HBA to the Storage Array and don't even use the other paths at all.

    Can they set up their system so that the MSCS cluster volumes are RDMs with "fixed" or "last-used" multipathing, and the rest of the volumes (the data RDMs) are "round-robin". At a minimum that would improve performance.

    Stuart

    DB:2.51:Vmware Round-Robin Multipathing Mixed With Last-Used On Clariion. z7


    Hi Stuart,

    yes, they could use different NMP settings on a per device base.

    All they should keep in mind that they will use identical NMP settings for a device on each ESXi Server which could access that device.

    Btw, EMC PP/VE does support virtual MSCS with pRDM's, so it would avoid to run into the limitations from native VMware NMP.

    EMC PowerPath/VE for VMware vSphere

    Regards,

    Ralf

  • RELEVANCY SCORE 2.51

    DB:2.51:How To Identify Which Lun Has A Fixed , Mru Or Rr Path Policy On Esx4 ? s7



    After upgrading from esx 3.5 to esx 4.0 and using ALUA for Netapp storage the path policy has to be changed from FIXEd to Round Robin.

    VMware KB Articel:

    http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKCdocType=kcexternalId=1010713sliceId=1docTypeID=DT_KB_1_1dialogID=24058009stateId=1 0 24056058

    http://www.vmware.co.nz/resources/compatibility/detail.php?device_cat=sandevice_id=3977

    Release

    Mode

    Recommended

    Path Policy

    Firmware

    Device Driver(s)

    Configuration

    ESX 4.0

    VMW_SATP_ALUA

    VMW_PSP_MRU

    Data ONTAP 7.3

    N/A

    FC Switched

    For esx4i alua can be confiured over vsphere cli

    Command for Esxi 4 and esx 4 per vsphere cli

    esxcli --server esxhost nmp satp setdefaultpsp --psp VMW_PSP_RR --satp VMW_SATP_ALUA

    Command for esx (service console)

    esxcli --server esxhost nmp satp setdefaultpsp --psp VMW_PSP_RR --satp VMW_SATP_ALUA

    After setting this ALUA config only new created LUN's have the default setting ALUA and Round Robin.

    For the existing LUN'S the path polica was with esx 3.5 set to fixed . After the upgrade to esx 4.0 they are allthough set to Fixed.

    What is the command to find out which old luns are set to a fIxed policy and the new LUN's are set to Round Robin.

    From this vmware blog, there is an example for set . Is there an get command to find fixed , rr or mru ?

    http://blogs.vmware.com/vipowershell/2008/07/managing-storag.html

    DB:2.51:How To Identify Which Lun Has A Fixed , Mru Or Rr Path Policy On Esx4 ? s7


    I'm afraid that PowerCLI has no straightforward method to list local directories in the COS.

    The bypass you can use is the plink.exe command (that comes with the PuTTY suite) combined with a sudo setup in the COS.

    You can then call the plink.exe from your PS script, execute the ls command and capture the output into a PS variable or pipe.

    Have a look at Retrieve VMX for a sample how to do this.

  • RELEVANCY SCORE 2.51

    DB:2.51:Ftp To A Round Robin Server cf



    hi,

    there is a round robin server whose IP address and hostname is dynamic,since they have multiple servers.

    how PI can do FTP to a round robin server.

    DB:2.51:Ftp To A Round Robin Server cf


    hi,

    there is a round robin server whose IP address and hostname is dynamic,since they have multiple servers.

    how PI can do FTP to a round robin server.

  • RELEVANCY SCORE 2.50

    DB:2.50:Change From Round Robin To Weighted Round Robin dx



    Hello,

    We recently changes a content rule from round robin to weighted round robin.

    With round robin, if a server fell out of the pack then came back online the CSS would still issue requests in a round robin fashion to all servers.

    With weighted round robin, what 'seems' to happen is that the CSS sends the majority of request to the server that has just come back online.

    Is this how it is supposed to work ? If so we have a potential issue with a single server being flooded by new connections.

    cheers,

    Mike

    DB:2.50:Change From Round Robin To Weighted Round Robin dx


    Hi Mike,

    Same thing happens to me, can't figure it out, maybe some kind of algorithm is behind this?

    Regards,

    Hao Dai

  • RELEVANCY SCORE 2.50

    DB:2.50:Vplex Metro In Combination With Vsphere 5.1 (Esxi 5.1) zs



    I have i very simple question.

    what is the Native Multipath Setting on a ESXi 5.1 host when he get its storage from a VPLEX environment.

    (Fixed , Round Robin or something different)

    i looking for a recent document where it is explained.

  • RELEVANCY SCORE 2.49

    DB:2.49:Best Practice Ds3512 Iscsi Dual Ctrl With Vsphere Esx 5.0 z9



    Hello, My DS3512 is ready to host three ESX5.0.0,623860 servers in iSCSI Mode. What is the best practice to configure the iSCSI and ESX? Is it possible to use Round Robin Mulitpathing with this kind of Storage? What is the supported and recommended way by VMWare/IBM? Thanks,

    DB:2.49:Best Practice Ds3512 Iscsi Dual Ctrl With Vsphere Esx 5.0 z9


    Hi,

    Seeing Standby clearly indicates this not using the desired MPIO. You should see 4 paths to each device with all Active but only two Active (I/O) and that would be the two to the owning head.The other 2 are to the other head where nvram comes into play if failure on the first head so no transfer of device to new owning head (old approach). You have to make sure you have the new storage firmware that supports this feature. You will know by your SATP detection. After storage upgrade you may have to make the devices host groups on the storage enabled with this function checked before reconnecting. Hope this helps.

  • RELEVANCY SCORE 2.48

    DB:2.48:Powerpath/Ve Support With Microsoft Clustering On Vmware z8



    Just having a look through the vSphere 5.0 MSCS guide (linked below) and found the following statement.

    http://pubs.vmware.com/vsphere-50/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-50-mscs-guide.pdf

    "With native multipathing (NMP), clustering is not supported when the path policy is set to round robin. Third-party multipathing plug-ins might support round robin or other load balancing behavior with Microsoft clusters. Support of third-party multipathing plug-ins is provided by the plug-in vendor"

    Anyone know if PowerPath/VE is supported in this type of configuration?

  • RELEVANCY SCORE 2.48

    DB:2.48:Round Robin Schduling. aj


    I want to design a samulation of round robin scheduling. But i am having problems.
    How can i find the starting time of a process and the finishing time of a process.
    Can any body help me in this.
    If any body have the algo of Round robin scheduling please provide me.
    I will be thankful to him/her.

    DB:2.48:Round Robin Schduling. aj

    I want to design a samulation of round robin scheduling. But i am having problems.
    How can i find the starting time of a process and the finishing time of a process.
    Can any body help me in this.
    If any body have the algo of Round robin scheduling please provide me.
    I will be thankful to him/her.

  • RELEVANCY SCORE 2.48

    DB:2.48:Psp Settings Vor Vmware Vmsc az



    Hi all,

    I am wondering what PSP can be used in a customer's environment. We have VPlex Metro 5.2.latest with Witness and vSphere 5.5.latest. The hosts are cross-connected to both VPlex clusters for enhanced resilience, latency is below 1ms. With non-uniform host access I could use Round-Robin, but how about this environment? Do we have to use fixed path policy? If so, would PowerPath help us out, is auto-standby supported?

    Hope to get some ideas.

    Oliver

    DB:2.48:Psp Settings Vor Vmware Vmsc az


    Hi Sean,

    Thanks a lot! So I think that we would either use uniform with PoerPath or non-uniform with VMware NMP/RR.

    Oliver

  • RELEVANCY SCORE 2.47

    DB:2.47:Difference Of Pp/Ve And Vmware Nmp Round Robin a7



    VMware NMP support a path selection algorithm named Round Robin, i think this can distribute the I/O evenly, what's the advantage of PP/VE over VMware NMP RR.

    DB:2.47:Difference Of Pp/Ve And Vmware Nmp Round Robin a7


    EMC PowerPath/VE provides significant enhancements over the VMwares native multipathing, including:

    PowerPath/VE enhances the redundant infrastructure created by Storage AdministratorsRound Robin algorithms (i.e. VMware NMP)will use all the paths; however, they dont use those paths intelligently and efficientlyPowerPath/VE provides intelligent path routing with optimized load balancing policies for EMC and non-EMC arraysWith Symmetrix Optimization and CLARiiON Optimization policies, PowerPath/VE considers the number of I/Os, size of I/Os, type of I/Os, queuing delay, latency of recent I/Os, and throughput of I/Os when making a routing decisionThere are eight policies in total
    PowerPath/VE provides intelligent path testing of idle and dead paths
    Path testing is load based. A busier system with more I/O completions requires less testingTesting idle paths to a device ensure I/O success when the application begins driving I/OTesting dead paths will return them to use quicklyPowerPath/VE provides advanced path failover by proactively shifting I/O load to known viable paths for hosts sharing a common path when a failure occursMinimizes administrator cycles since no configuration is required. PowerPath/VE automatically recognizes the array type and configures the optimized load balancing and failover policies without the need for administrator intervention
    PowerPath/VE provides advanced path management and monitoring
    Deeper integration with vCenter StorageViewer providing path state detailsCentralized management of PowerPath/VE for vSphere hosts using a remote version of the powermt CLIPath latency monitoring measures the I/O completion time on all HBA paths and provides a user-settable threshold monitor. This aids Storage Administrators in determining whether an application issue is a result of failing SAN pathsPowerPath/VE responds to decaying paths (paths that have not entirely failed) by redistributing some of the I/O to healthier paths

  • RELEVANCY SCORE 2.47

    DB:2.47:Iscsi Round Robin And Multiple Extents pp



    Got a question about iSCSI Round Robin Multipathing and multiple extents. iSCSI storage is based on 3 Dell EqualLogic PS6000XV's. Storage volume is 15.13TB total that consits of 31 500MB extents. I can look at the main volume through Vsphere cleint and see that round robin is enabled. If I look at extent1, it shows round robin. If I look at extent2 and bleow, it shows me fixed pathing. Do I need to set round robin on each individual extent?

    DB:2.47:Iscsi Round Robin And Multiple Extents pp


    FYI: Here's a script for ESXi v5, that will set all the EQL volumes to Round Robin and most importantly set the IOPs value to 3. The default value of 1000 doesn't result in efficient use of all links.

    This is a script you can run to set all EQL volumes to Round Robin and set the IOPs value to 3.

    esxcli storage nmp satp set --default-psp=VMW_PSP_RR --satp=VMW_SATP_EQL ; for i in `esxcli storage nmp device list | grep EQLOGIC|awk '{print $7}'|sed 's/(//g'|sed 's/)//g'` ; do esxcli storage nmp device set -d $i --psp=VMW_PSP_RR ; esxcli storage nmp psp roundrobin deviceconfig set -d $i -I 3 -t iops ; done

    After you run the script you should verify that the changes took effect. #esxcli storage nmp device list

    Here's one for ESX(i) v4.x

    Change to Vmware RR and set IOPS to 3

    Script to change to round robin:

    for i in `esxcli nmp device list | grep -i -B1 "ay Name: EQLOGIC" | grep -i "naa." | grep -i -v "ay Name"` ; do esxcli nmp device setpolicy --device $i --psp VMW_PSP_RR; done

    Script to change the IOPS to 3:

    for i in `esxcli nmp device list | grep -i -B1 "ay Name: EQLOGIC" | grep -i "naa." | grep -i -v "ay Name"` ; do esxcli nmp roundrobin setconfig --device $i --iops 3 --type iops; done

  • RELEVANCY SCORE 2.47

    DB:2.47:How To Assign Round Robin Assignment In Remedy 6.3 xc



    How to assign round robin ticket assignment in remedy 6.3

  • RELEVANCY SCORE 2.47

    DB:2.47:Md3200i Slow Read Performance 8p


    Sorry for the crossposting, i read pots on this forum and I wasnt able to find a solution.

    Actually we are running a linux server with multipath. MD3200i are directly connected whit 8 1Gb Ethernet card.

    here the multipah conf

    defaults {
    udev_dir /dev
    polling_interval 10
    selector round-robin 0
    path_grouping_policy multibus
    getuid_callout /lib/udev/scsi_id --whitelisted --device=/dev/%n
    prio const
    path_checker directio
    rr_min_io 3
    rr_min_io_rq 5
    flush_on_last_del no
    max_fds 8192
    rr_weight priorities
    failback immediate
    no_path_retry fail
    queue_without_daemon no
    user_friendly_names no
    mode 644
    uid 0
    gid disk
    }
    blacklist {
    wwid 26353900f02796769
    devnode ^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*
    devnode ^hd[a-z][[0-9]*]
    wwid 36848f690ea06050018916f2817c3b9f9 #sda
    wwid 36848f690ea06050018916f2a17eac886 #sdb
    device {
    vendor DEC.*
    product MSA[15]00
    }
    }
    blacklist_exceptions {
    devnode ^dasd[c-d]+[0-9]*
    wwid IBM.75000000092461.4d00.34
    }
    devices {
    device {
    vendor DELL
    product MD32xxi
    path_grouping_policy group_by_prio
    prio rdac
    polling_interval 5
    path_checker rdac
    path_selector round-robin 0
    hardware_handler 1 rdac
    failback immediate
    features 2 pg_init_retries 50
    no_path_retry 30
    rr_min_io 3
    rr_min_io_rq 5
    prio_callout /sbin/mpath_prio_rdac /dev/%n
    }
    }

    multipath -ll
    3690b11c0002c79dc000003515119ded4 dm-0 DELL,MD32xxi
    size=36T features=3 queue_if_no_path pg_init_retries 50 hwhandler=1 rdac wp=rw
    |-+- policy=round-robin 0 prio=6 status=active
    | |- 7:0:0:0 sdc 8:32 active ready running
    | |- 9:0:0:0 sdd 8:48 active ready running
    | |- 8:0:0:0 sdf 8:80 active ready running
    | `- 14:0:0:0 sdj 8:144 active ready running
    `-+- policy=round-robin 0 prio=1 status=enabled
    |- 11:0:0:0 sde 8:64 active ghost running
    |- 12:0:0:0 sdg 8:96 active ghost running
    |- 10:0:0:0 sdh 8:112 active ghost running
    `- 13:0:0:0 sdi 8:128 active ghost running

    A bref speed test show

    d of=dd2.dat if=/dev/zero bs=1G count=65
    65+0 records in
    65+0 records out
    69793218560 bytes (70 GB) copied, 131.394 s, 531 MB/s

    dd if=dd2.dat of=/dev/null
    136314880+0 records in
    136314880+0 records out
    69793218560 bytes (70 GB) copied, 434.808 s, 161 MB/s

    I played with MTU disabling/enabling JUMBO frames and I tried various size of MTU.

    I also played with reading cache sizes and flush settings as stated in other posts. Improving a little bit performances but the write/read ratio constantly remain about 4:1.

    Any suggestion will be appreciated.

    Bests

    DB:2.47:Md3200i Slow Read Performance 8p

    Sorry for the crossposting, i read pots on this forum and I wasnt able to find a solution.

    Actually we are running a linux server with multipath. MD3200i are directly connected whit 8 1Gb Ethernet card.

    here the multipah conf

    defaults {
    udev_dir /dev
    polling_interval 10
    selector round-robin 0
    path_grouping_policy multibus
    getuid_callout /lib/udev/scsi_id --whitelisted --device=/dev/%n
    prio const
    path_checker directio
    rr_min_io 3
    rr_min_io_rq 5
    flush_on_last_del no
    max_fds 8192
    rr_weight priorities
    failback immediate
    no_path_retry fail
    queue_without_daemon no
    user_friendly_names no
    mode 644
    uid 0
    gid disk
    }
    blacklist {
    wwid 26353900f02796769
    devnode ^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*
    devnode ^hd[a-z][[0-9]*]
    wwid 36848f690ea06050018916f2817c3b9f9 #sda
    wwid 36848f690ea06050018916f2a17eac886 #sdb
    device {
    vendor DEC.*
    product MSA[15]00
    }
    }
    blacklist_exceptions {
    devnode ^dasd[c-d]+[0-9]*
    wwid IBM.75000000092461.4d00.34
    }
    devices {
    device {
    vendor DELL
    product MD32xxi
    path_grouping_policy group_by_prio
    prio rdac
    polling_interval 5
    path_checker rdac
    path_selector round-robin 0
    hardware_handler 1 rdac
    failback immediate
    features 2 pg_init_retries 50
    no_path_retry 30
    rr_min_io 3
    rr_min_io_rq 5
    prio_callout /sbin/mpath_prio_rdac /dev/%n
    }
    }

    multipath -ll
    3690b11c0002c79dc000003515119ded4 dm-0 DELL,MD32xxi
    size=36T features=3 queue_if_no_path pg_init_retries 50 hwhandler=1 rdac wp=rw
    |-+- policy=round-robin 0 prio=6 status=active
    | |- 7:0:0:0 sdc 8:32 active ready running
    | |- 9:0:0:0 sdd 8:48 active ready running
    | |- 8:0:0:0 sdf 8:80 active ready running
    | `- 14:0:0:0 sdj 8:144 active ready running
    `-+- policy=round-robin 0 prio=1 status=enabled
    |- 11:0:0:0 sde 8:64 active ghost running
    |- 12:0:0:0 sdg 8:96 active ghost running
    |- 10:0:0:0 sdh 8:112 active ghost running
    `- 13:0:0:0 sdi 8:128 active ghost running

    A bref speed test show

    d of=dd2.dat if=/dev/zero bs=1G count=65
    65+0 records in
    65+0 records out
    69793218560 bytes (70 GB) copied, 131.394 s, 531 MB/s

    dd if=dd2.dat of=/dev/null
    136314880+0 records in
    136314880+0 records out
    69793218560 bytes (70 GB) copied, 434.808 s, 161 MB/s

    I played with MTU disabling/enabling JUMBO frames and I tried various size of MTU.

    I also played with reading cache sizes and flush settings as stated in other posts. Improving a little bit performances but the write/read ratio constantly remain about 4:1.

    Any suggestion will be appreciated.

    Bests

  • RELEVANCY SCORE 2.46

    DB:2.46:Thread: Dns Round-Robin kz


    We have an F5 load balancer that is using round robin algorithum for our two

    app servers. We want to get rid of the F5\'s and use internal DNS round

    robin...

    I\'m assuming if i make two RR entries for the DNS entry it will work?

    Will the client that goes to app1, always goto app1? how do I set the RR

    record to expire?

    What happens if app1 is down, will the client goto app2 or hang?

    DB:2.46:Thread: Dns Round-Robin kz

    In article IlRoc.10488$Ob.4314@prv-forum2.provo.novell.com, D. SKye

    Hodges wrote:

    The client SHOULD re-query DNS when the TTL expires, but if we\'re

    talking about Microsoft.... then who knows, it may or may NOT

    re-query DNS, but it SHOULD.

    And if it\'s W2K or XP, disabling the DNS Client service will likely be

    helpful in these cases.

    bd

    NSC Volunteer SysOp

  • RELEVANCY SCORE 2.46

    DB:2.46:Multipathing Settings And Hp Msa2000 z9



    I am in the process of upgrading all of our hosts to ESXi 4.1 from ESX 4 and I am trying to figure out what the best pathing settings are for our MSA 2000 fibre SAN. We have an HP EVA SAN that has a nice long document on best practices for VMWare and I have made the recommended config changes on the ESXi hosts for the EVA LUNs, which is switching to round-robin and setting IOPs limit to 1. Unfortunatly I can't find any documentation for our MSA 2000 regarding multipathing or any best practices document for VMware from HP. I have a feeling just putting it to round robin and setting the IOPs limit to 1 for the MSA is not going to work out too well, so does anyone have any insight on what the best practices for multipathing are for a HP MSA 2000 fibre SAN?

    DB:2.46:Multipathing Settings And Hp Msa2000 z9


    All of the NMP/PSP information for what you can set on the devices from any particular storage array can be found on the VMware HCL:

    http://www.vmware.com/resources/compatibility/search.php?deviceCategory=san

    Click on the version of ESX that you're looking for, then click on "FC", then ignore the rest of the options and type "MSA" into the search box - then you can click on the model of array that you have and it will show you whether or not you can use Round Robin or if you have to use MRU

  • RELEVANCY SCORE 2.46

    DB:2.46:Round Robin X Sharepoint j7


    Senhores é possivel configurar o Sharepoint utilizando o recurso Round Robin do DNS?

    DB:2.46:Round Robin X Sharepoint j7

    Roberto quero ter outro servidor com o serviço de search se o crawl ficar fora por 24hs nao é uum problema. Mas se eu nao levantar outro já passa a ser.
    O site tem que estar no aro serviço também, nao posso ter apenas uma maquina com o serviço search.
    Tentamos criar o Search Aplicattion Service em outra máquina, mas ele pergunta se utilizamos o mesmo Pool de aplicaçoes ou ser criamos outro pool. Nas opções de pool os nomes são nomes padrões:
    Sharepoint Web Services Default
    Sharepoint Web Services System
    Nao sabemos qual escolher.
    Criamos um novo pool o search na aplicação nao funciona.

  • RELEVANCY SCORE 2.45

    DB:2.45:Setting Round Robin Path Policy - Can I Just Use The Gui? 3z



    I have HP EVA6400 arrays and also HP XP20000.

    I am using ESX 4.1 U1 and the recommendation from HP is to use the Round Robin multipathing policy.

    I assumed I could simply use the vSphere client and select configurationstoragedatastorepropertiesmanage pathsRound Robinchange

    This approach would certainly changed the path policy for that server for the selected LUN, I would then repeat for each.

    But, I read something on a blog lastnight which mentioned having to perform the path setting from the CLI using the esxcli nmp VMW_PSP_RR setting.

    Can someone enlighten me please.

    Thanks

    DB:2.45:Setting Round Robin Path Policy - Can I Just Use The Gui? 3z


    John, you've been very helpful.

    Thanks for the assistance.

  • RELEVANCY SCORE 2.45

    DB:2.45:Load Balancing Policy cc



    how can i configure load balancing policy (round robin, less conection ...) in mod_cluster.

    i use apache 2 and Jboss AS7

    thanks

    DB:2.45:Load Balancing Policy cc


    Round robin is not an optimal load-balancing policy, you get this behaviour though if you use simple load provider that statically returns the same load number (e.g. 100).

    Ideally, you want to compose a set of metrics to make best load-balancing choices acording to real server load.

  • RELEVANCY SCORE 2.44

    DB:2.44:Mpio Error The Parameter Is Incorrect xc


    Hi there.
    I have configured a windows 2008 r2 server to access our MSA 2000 SAN.
    I've configured 2 iSCSI NICs and have setup 4 paths to the SAN. All paths are listed as active.
    It seems to work ok but when I go into device details under the MPIO settings (in the MS iscsi intiator) I get the error message
    the parameter is incorrect. the round robin with subset policy executes the round robin policy only on paths designated as active. the standby paths will be tried on a round-robin approach upon failure of all active paths.
    Can anyone explain this error to me and is it anything I need to worry about?
    Cheers,
    Al
    ps - I can supply a screenshot if that helps.

    DB:2.44:Mpio Error The Parameter Is Incorrect xc

    Hi,
    This is a known issue (I am assuming that you are not at all changing any setting in iscsicpl and just clicking the OK button), although there are no current plans to fix this.
    And I don't think you need to worry about that.
    There is a workaround of using diskmgmt.msc instead of iscsicpl, if that helps.Thanks, Ashutosh

  • RELEVANCY SCORE 2.44

    DB:2.44:Round Robin Tables ds


    Hi All!
    I did a rudimentary implementation of round robin tables using triggers (pasted at the end of this post). Is there a better way to have such an implementation? Do you feel this qualifies as a feature request for Oracle (a new type of table). Such tables would be very useful for logging/auditing information....
    Let me have your thoughts on this.

    Thanks and Regards,
    Aniruddha

    http://oraclesnippets.blogspot.com/2007/08/round-robin-tables.html

    DB:2.44:Round Robin Tables ds

    Even if you are storing monitoring information, though, it's going to be far more efficient to delete old information in a nightly batch process than to do that processing every time I insert a record. Over the course of a day, for example, a monitoring application would insert thousands or tens of thousands of records in a bunch of single-row inserts. I'd much rather have a purge process that runs once a day rather than tens of thousands of times a day. All those individual inserts would cause a full-scan of the index at least and be expected to cause 1 of the oldest rows to be deleted.

    If you are dealing with message queues, you really ought to be using Oracle's built-in Advanced Queues functionality.

    As for the particulars of your implementation, there is no need for dynamic SQL in your DELETE-- you can use static SQL. If you want to use dynamic SQL for some reason, you really ought to use bind variables.

    Justin

  • RELEVANCY SCORE 2.44

    DB:2.44:Is A Fc-Switch Required To Connect Esx 4.0 To A Fc-San? 8s



    Hi,

    another question. We're planning to make use of a HP StorageWorks MSA 2000fc G2 Fibre Channel SAN to connect

    to ESX servers to it. The MSA2000fc G2 comes with two controllers and two ports per controller.

    In theory, we could connect two ESX servers directly to the SAN controller's ports without the need to install a switch.

    However, our distributor told me that at least in ESX 3.5 this wasn't possible as ESX considered such configs as

    Direct Attached Storage.

    Does anybody know something about this? Shouldn't it be possible to use such a configuration without the need to

    install a FC switch? Do any of you guys use such a configuration?

    Thanks

    DB:2.44:Is A Fc-Switch Required To Connect Esx 4.0 To A Fc-San? 8s

    First, for vSphere 4 only MSA2012sa is supported at the time of the post writing. You should expect FC and iSCSI models comming soon on the support matrix for storage.

    Second, if you are going to use ESX 3.5 (U4) the configuration proposed is supported by VMware (direct attach) for MSA2312fc (firmware: M100R06 and M100R18) and MSA2324fc. Another array known to be supported in a direct connect mode is EMC CLARiiON AX4-5, which you can consider. Now it is only supported in DA for ESX 4.0 (not ESX 3.5, but I remember that previously, at least for some time, it was). Always consult: http://www.vmware.com/resources/compatibility/search.php

    Regards,

    Oczkov

  • RELEVANCY SCORE 2.44

    DB:2.44:Exchange 2013 - 2 Cas/Mailbox Exchange Servers With Dag, Balancer Or Round Robin? jm


    Hello,
    I am searching information about pro and cons about implementing a balancer or round robin for CAS role. If I have 2 multirole Exchange Servers with DAGs, and I want to implement HA for CAS role, what is the pro and cons about implementing a balancer or
    DNS round robin? As the following article (http://exchangeserverpro.com/exchange-2013-client-access-server-high-availability/) it seems like Outlook cliente Works
    well with DNS round robin, but is there anything that we have to take in count? And if round robin Works well, why implement a balancer?

    Thanks

    Cristian L Ruiz

    DB:2.44:Exchange 2013 - 2 Cas/Mailbox Exchange Servers With Dag, Balancer Or Round Robin? jm


    DNS round-robin works fine for load balancing, but not so well for high availability. Say your client looks up webmail.yourdomain.com in DNS, and is pointed to server 10.1.1.100, which is down. What the user will see is some variety ofNot
    Available. The client won't look in DNS again for an alternate server.
    Go with load balancing, be it NLB or preferably hardware or virtual load balancing.

    Ed Crowley MVP There are seldom good technological solutions to behavioral problems.

    DNS Round-Robin does OK for availability. Clients since the early 2000s have supported multiple IP addresses. Most time out after about 20 seconds and try the next IP address up to four. The obvious drawback is that 50% of your users have a 20 second outage
    for every connection attemptthe entire time your CAS is down. Any other method of load balancing should be better.

  • RELEVANCY SCORE 2.44

    DB:2.44:Vsphere 5.5 / 10gb / I/O Problem / Equallogic Ps6510x / Powerconnect 8132f sj



    Hi guy i have i/o problem from my vsphere my vm are like 100mg/sec only on vpshere

    when I try physical server that are connected to my san the speed are 900mg/sec

    Hosts : Dell R820 / (vsphere 5.5 are Installed on the 2 sd card Mirror)

    2 vmkernel are created on the Broadcom bcm57800 / and uses the iscsi software and use the Mem and round robin

    I set jumbo frame at 9000 on vmkernel / switch

    The switch are the powerconnect 8132f 10GB

    San : Equallogic PS6510X

    Vsphere / Equallogic all are at the latest update

    DB:2.44:Vsphere 5.5 / 10gb / I/O Problem / Equallogic Ps6510x / Powerconnect 8132f sj


    Neither the ESXi network stack nor the ESXi SW iSCSI initiator support DCB. For DCB to work all participating devices must support it. VMware can confirm that. DCB falls under the partner verified solutions.

    kb.vmware.com/.../search.do

    If you have one non DCB server using the SAN, you can use DCB. Additionally DCB iSCSI vs. FCoE, has some specific features that also need to be supported.

    For ESXi you would need the broadcom configured as Converged Network Adapter, (CNA). All switches in the SAN would have to support DCB and be properly configured. DCB is not a plug-n-play technology. If you were planning on using iSCSI from Guest VMs, I.e. to leverage HIT kit support for Exchange or SQL, then again you cant use DCB, since Windows, nor Linux support DCB with their iSCSI initiator.

    If you have dedicated switches for iSCSI, then the benefit of DCB is greatly lessened.

    Regards,

  • RELEVANCY SCORE 2.44

    DB:2.44:New Tool To Automate Iscsi Configuration For Esxi 4.X And 5.X 97



    Hi there,

    In this post I will tell you more about my tool called AutoConf iSCSI.

    AutoConf iSCSI is an automating tool for creating iSCSI configuration on ESXi 4.X / 5.X following best practices (1 vmnic = 1 vmkernel, jumbo frames ...). Here is a screenshot :

    It's currently actively supporting 3 different types of iSCSI arrays (all tested and approved) :

    HP P4000 LeftHandDell EquallogicHP P2000 MSAalmost any iSCSI ALUA arrays

    Its features are :

    Automatically discovers vmnics, vmhba, vswitches and vmkernelCreates a vSwitchSets up vmkernel ports with IP (and jumbo frames if set)(MSA mode only) alternates IP on each subnetLinks only one vmnic to each vmkernel portsLinks each vmkernel port to software iSCSI vmhbaEnables software iSCSIChanges PSP to Round Robin only for your storage array paths (can be disabled in config file)

  • RELEVANCY SCORE 2.44

    DB:2.44:Vsphere Esxi 5 Host Losing Connection To P2000 G3 Sas Msa 79


    VMware vSphere ESXi 5.0 Hosts lose connection to HP P2000 G3 SAS MSA

    We have 3 ESXi 5.0 Hosts that continue to lose connectivity to our HP P2000 G3 SAS MSA. It happens about every 12-24 hours, and sometimes it affects only 1-2 hosts, and sometimes all 3 at the same time.
    This is our build.
    VMware Version: ESXi 5.0.0, 504890 HP VAAI for vSphere5 (VAAI version 2.10) is installedHost Hardware: Cisco UCS C210 M2 (R210-2121605W) Firmware: 1.4(2)Proc: Intel Xeon X5650 @ 2.67GHz (x2)Memory: 98GBPCIe SAS Controller: HP SC08eSAN: HP P2000 G3 SAS Firmware Bundle Version: TS230P008 Controller Code Version: TS230P03Disk Slots: 24x300GBVdisk1: 1498GB (6x disk RAID5)Vdisk2: 1498GB (6x disk RAID5)Vdisk3: 1498GB (6x disk RAID5)Vdisk4: 599GB (6x disk RAID10)
    Since each HP SC08e SAS HBA has 2 ports, it is connected to both controllers on the MSA, and vSphere is configured to use Round-Robin for its Path Selection.

    About every 12-24 hours we will see this appear in the vmkernel.log

    2011-12-13T11:11:13.018Z cpu12:4786)WARNING: vmw_psp_rr: psp_rrSelectPath:1146:Could not select path for device "naa.600c0ff000123d035313724e01000000".2011-12-13T11:11:13.018Z cpu12:4786)WARNING: NMP: nmp_IssueCommandToDevice:2954:I/O could not be issued to device "naa.600c0ff000123d035313724e01000000" due to Not found2011-12-13T11:11:13.018Z cpu12:4786)WARNING: NMP: nmp_DeviceRetryCommand:133:Device "naa.600c0ff000123d035313724e01000000": awaiting fast path state update for failover with I/O blocked. No prior reservation exists on the device.2011-12-13T11:11:13.018Z cpu12:4786)WARNING: NMP: nmp_DeviceStartLoop:721:NMP Device "naa.600c0ff000123d035313724e01000000" is blocked. Not starting I/O from device.2011-12-13T11:11:14.018Z cpu15:41049)WARNING: vmw_psp_rr: psp_rrSelectPathToActivate:972:Could not select path for device "naa.600c0ff000123d035313724e01000000".2011-12-13T11:11:14.018Z cpu12:43188)WARNING: vmw_psp_rr: psp_rrSelectPathToActivate:972:Could not select path for device "naa.600c0ff000123dd17213724e01000000".2011-12-13T11:11:14.018Z cpu16:45617)WARNING: NMP: nmpDeviceAttemptFailover:599:Retry world failover device "naa.600c0ff000123d035313724e01000000" - issuing command 0x412441152ac02011-12-13T11:11:14.018Z cpu16:45617)WARNING: vmw_psp_rr: psp_rrSelectPath:1146:Could not select path for device "naa.600c0ff000123d035313724e01000000".2011-12-13T11:11:14.018Z cpu18:4786)WARNING: vmw_psp_rr: psp_rrSelectPath:1146:Could not select path for device "naa.600c0ff000123dd17213724e01000000".2011-12-13T11:11:14.018Z cpu16:45617)WARNING: NMP: nmpDeviceAttemptFailover:658:Retry world failover device "naa.600c0ff000123d035313724e01000000" - failed to issue command due to Not found (APD), try again...2011-12-13T11:11:14.018Z cpu16:45617)WARNING: NMP: nmpDeviceAttemptFailover:708:Logical device "naa.600c0ff000123d035313724e01000000": awaiting fast path state update...

    And then looking at the MSA, we will see that the SAS ports will show as Disconnected
    From here the only option is to reboot each of the affected UCSs and recover the environment.

    DB:2.44:Vsphere Esxi 5 Host Losing Connection To P2000 G3 Sas Msa 79


    It turned out to be the Interupt Remapping options in both the Cisco UCS bios and in VMware. Turn it off in both places and it should resolve it.

  • RELEVANCY SCORE 2.44

    DB:2.44:Recomendations For Sizing Luns For Csvs? z8


    What's the recommendation for sizing LUNs for use as CSVs? I've got a 4 node Hyper-V R2 cluster connected into an MSA 2000fc fiberchannel SAN. With 4TB of available storage, should I be making a single LUN, or should I parse that out into say 4 1TB LUNs?Thinking it through, with a Hyper-V RTM cluster, we had a disk queue for each LUN, and by extension each Virtual Machine. Moving to a single LUN is going to reduce that to a single disk queue for each LUN, and using a single LUN means a single disk queue for each node shared across all virtual machines attached to that node.Somthing

  • RELEVANCY SCORE 2.44

    DB:2.44:Mod_Cluster And Round Robin Dns za



    Hi

    Does mod_cluster and round robin DNS play nice together and/with tomcat?

    according to this link http://www.tomcatexpert.com/blog/2010/07/12/trick-my-proxy-front-tomcat-haproxy-instead-apache

    using round robin DNS confuses tomcat session manager

    do you have comment on that?

    do you have a working installation which use round robin DNS to balance two or more httpd

    and what happen if one httpd node fails? does that result in an error or just anotherdns lookup?

    thanks

    Joe

    DB:2.44:Mod_Cluster And Round Robin Dns za


    Hi

    Does mod_cluster and round robin DNS play nice together and/with tomcat?

    according to this link http://www.tomcatexpert.com/blog/2010/07/12/trick-my-proxy-front-tomcat-haproxy-instead-apache

    using round robin DNS confuses tomcat session manager

    do you have comment on that?

    do you have a working installation which use round robin DNS to balance two or more httpd

    and what happen if one httpd node fails? does that result in an error or just anotherdns lookup?

    thanks

    Joe

  • RELEVANCY SCORE 2.43

    DB:2.43:Hba c7



    Hi,

    What is HBA and is it related to Round Robin., MRU Fixed? Can some one please give a good link which explains Round Robin., MRU Fixed.

    Thanks,

    Prashant

    DB:2.43:Hba c7


    Thank You buddy.

    -Prashant

  • RELEVANCY SCORE 2.43

    DB:2.43:Sccsi Resercation Problems! Should I Change Managed Paths To Round Robin? ms



    i have lots of issues of SCSI Reservation problems. I am Running VC 2.5 Update 5 and ESx 3.5 Update 4

    should i change all VMFS on all ESXs to work RoundRobin? altough it is "Experimental" in 3.5

    lots of people talked about this as a good soloution cause in vSphere it is Builed in i think.

    need helpppp!??!?!?!?!

    DB:2.43:Sccsi Resercation Problems! Should I Change Managed Paths To Round Robin? ms


    your USP V will handle RR well, and its a good choice, but wont solve your SCSI reservations, which usually indicates too many VMs on a LUN or poor array performance.

    --Matt

    VCP, vExpert, Unix Geek

  • RELEVANCY SCORE 2.43

    DB:2.43:Hp Msa 2040 Multipathing zx



    Hello everyone,

    Recently we have purchased HP MSA 2040 FC SAN. SAN came with dual controllers. each controller has 4 ports. we have configured it with 2 LUNs. currently we connected all controller ports (8) to two Brocade 300 SAN switches. after configuration VMware shows 8 path to particular LUN. we configured Round Robin as multipath policy. this is correct configuration ? if we use 8 paths it will give additional overhead to ESXI hosts ?

    please share your ideas.

    Regards,

    Lasantha.

    DB:2.43:Hp Msa 2040 Multipathing zx


    Hello everybody, according to the best practices for HP MSA2040 storage with VMware vSphere, HP recommends to set the iops Parameter for a LUN to 1 instead of 1000, when using Round Robin as Path Selection Policy.

    Changing iops=1 with the following command under ESXi 5.5 Update 2 with ...

    esxcli storage nmp psp roundrobin deviceconfig set --type=iops --iops=1 --device naa.xxxxxxxxxxxxxxxxxxx

    ... results in the following output for a device ...

    Path Selection Policy Device Config: {policy=iops,iops=1,bytes=10485760, ...}

    Before setting iops to 1, the output was {policy=rr,iops=1000, ...}

    Now, after setting iops to 1, the output is {policy=iops,iops=1, ...}

    Do I make mistakes with the esxcli command or is the policy name always changed from 'rr' to 'iops' ???

    Furthermore, I would like to know, if the iops setting can be changed on a LUN, which has VM directories with running VM's ???

    Is a restart necessary to make the changes effective?

    Regards,

    Didi7

  • RELEVANCY SCORE 2.43

    DB:2.43:Difference Between Msa 4.0 And 5.0 ca



    Hi,

    Can any body send the differences between MSA 4.0 and MSA 5.0

    Thanks in advance.

    Regards,

    Naidu

    DB:2.43:Difference Between Msa 4.0 And 5.0 ca


    Hi Wolfhard,

    Thanks for your prompt response. Can you please point me the technical difference between MSA 4.0 and MSA 5.0 like the way of writing the code in MSA 4.0 to MSA 5.0 the way of compilation,generation,publishing the application in MSA 4.0 to MSA 5.0.

    There is a huge difference between VB6.0 to MS.NET. Can we say the same in MSA 4.0 to MSA 5.0

    Can you please share if you have in handy difference document.

    Thanks in advance

    Regards,

    Naidu

  • RELEVANCY SCORE 2.43

    DB:2.43:Pat With Round-Robin s9



    Is it possible to do this?

    Regards,

    Gustavo.

    DB:2.43:Pat With Round-Robin s9


    Laurent,

    Thanks for your support...

    I'll try that...

    Regards,

    Gustavo.

  • RELEVANCY SCORE 2.43

    DB:2.43:Exchange 2010 Round Robin Cas 9k


    I'm setting up round robin for our exchange cas servers. I've added all the entries to dns and can ping it fine but when I try to assign the smtp name to the database it gives me this error:

    DB:2.43:Exchange 2010 Round Robin Cas 9k

    Hi,
    Let’s begin with the following article:
    http://technet.microsoft.com/en-us/library/ee332317(v=exchg.141).aspx
    “Each Mailbox database contains an RPCClientAccessServer value. This value is established when the database is created and it determines the Client Access server or Client Access array that the clients with mailboxes on that Mailbox server will use.”
    To make a placeholder for all the IPs, we can use CAS array which includes all the CAS servers. and every CAS server has an IP address.
    For more information about how to setup a CAS array, you can refer to the following article:
    http://blogs.technet.com/b/ucedsg/archive/2009/12/06/how-to-setup-an-exchange-2010-cas-array-to-load-balance-mapi.aspx
    If you have any question, please feel free to let me know.
    Thanks,

    Angela Shi
    TechNet Community Support

  • RELEVANCY SCORE 2.43

    DB:2.43:Psp Option And Multipath Setting With P2000g3 Fc And Vsphere 5.1 jd



    Hello

    I have to make a configuration consisting of two servers (hp proliant dl360 g7 )with vSphere 5.1 u1 and a storageHP p2000g3 FC.

    I tried to look on the HP website if there are best practice but I only found Configuration best practices for deploying VMware vSphere 4.1 on the HP P2000 G3 MSA Array combo controller that covers version 4.1

    My question is as follows:

    I have to make the necessary configurations for 4.1 even in version 5.1?

    I am referring to the round robin that in version 4.1 is configured with this command

    esxcli nmp SATP setdefaultpsp - SATP VMW_SATP_ALUA - psp VMW_PSP_RR

    and

    Best practices for changing the default PSP option

    As a best practice, change the default PSP option for VMW_SATP_ALUA to VMW_PSP_RR for P2000

    G3 SAN environments. Secondly, there are default for optimal system performance with the P2000 G3,

    configure the round robin load balancing selection to IOPS with a value of 1. This has to be done for

    every LUN using the command:

    esxcli nmp round robin setconfig - type "iops" - iops 1 - device

    naa.xxxxxxxxx

    thanks

    greetings

    DB:2.43:Psp Option And Multipath Setting With P2000g3 Fc And Vsphere 5.1 jd


    Hello

    I have to make a configuration consisting of two servers (hp proliant dl360 g7 )with vSphere 5.1 u1 and a storageHP p2000g3 FC.

    I tried to look on the HP website if there are best practice but I only found Configuration best practices for deploying VMware vSphere 4.1 on the HP P2000 G3 MSA Array combo controller that covers version 4.1

    My question is as follows:

    I have to make the necessary configurations for 4.1 even in version 5.1?

    I am referring to the round robin that in version 4.1 is configured with this command

    esxcli nmp SATP setdefaultpsp - SATP VMW_SATP_ALUA - psp VMW_PSP_RR

    and

    Best practices for changing the default PSP option

    As a best practice, change the default PSP option for VMW_SATP_ALUA to VMW_PSP_RR for P2000

    G3 SAN environments. Secondly, there are default for optimal system performance with the P2000 G3,

    configure the round robin load balancing selection to IOPS with a value of 1. This has to be done for

    every LUN using the command:

    esxcli nmp round robin setconfig - type "iops" - iops 1 - device

    naa.xxxxxxxxx

    thanks

    greetings

  • RELEVANCY SCORE 2.43

    DB:2.43:Vsphere 4.1 Fixed Vs Round-Robin da


    I am in the process of moving our 3.5 cluster to a new 4.1 cluster. I am almost down presenting all our hitachi 9985 storage to the new 4.1 cluster, and I had manually load-balanced the hba's/luns with a Fixed policy. Primary as that was the default plugin that came up.

    Then it just dawned on me this round-robin policy. Is this supported for all active/active arrays? or only ones with AULA?

    I am assuming our 9985's are true AA and each SP can access the lun with no ping-ponging at all. If that is the case,,,than wouldnt round robin be a far more efficient way for me to balance the hba's and luns on a host?

    Thank you.

    DB:2.43:Vsphere 4.1 Fixed Vs Round-Robin da


    I am sorry I missed that link, and in fact that is the link I had found googling last night. Thanks!

  • RELEVANCY SCORE 2.42

    DB:2.42:Round-Robin Assignment jz



    When using round-robin assignment based on agent availability; what happens when all agents are unavailable?

    Thank You

  • RELEVANCY SCORE 2.41

    DB:2.41:Question On Iscsi Networking. One Vswitch With Multiple Nics For Iscsi Or Seperate Vswitch's With Individual Nics? c1



    Hello, I have been toying with the idea on setting up my new vsphere 5 servers iSCSI interfaces using one vSwitch and multiple Vmkernal port groups inside it for each iSCSI adapter or keep each one separate in their own vSwitch and vmkernal port group. I have it configured as the second way with each iSCSI adapter is in its own vSwitch on my existing vsphere 4 servers and it works fine with round robin and multiplexing.

    The vmware 5 documentation lists each as an acceptable implementation. Is there any speed or performance difference from one configuration over the other? I have 4 gig nics allocated to iSCSI traffic. I am using the software iSCSI adapter since I will be using jumbo frame support.

    http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc_50%2FGUID-0D31125F-DC9D-475B-BC3D-A3E131251642.html

    Thank you. Doug

    DB:2.41:Question On Iscsi Networking. One Vswitch With Multiple Nics For Iscsi Or Seperate Vswitch's With Individual Nics? c1


    Interesting. That explains why I have not seen it in production. I always set roun robin pathing policies instead of fixed. Thanks for the info! I appreciate it.

  • RELEVANCY SCORE 2.41

    DB:2.41:What Is The Optimal Native Nmp Configuration For Round Robin On Vnx In Vsphere? z7



    All

    If my memory serves me correct, we recommend changing a setting vSphere for the number of IO's that are being send down a path to the storage before changing to the next path when running vSphere NMP round robin.

    Can somebody inform me the recommended setting for this?

    Thanks a lot

    LarsB

    DB:2.41:What Is The Optimal Native Nmp Configuration For Round Robin On Vnx In Vsphere? z7


    All

    If my memory serves me correct, we recommend changing a setting vSphere for the number of IO's that are being send down a path to the storage before changing to the next path when running vSphere NMP round robin.

    Can somebody inform me the recommended setting for this?

    Thanks a lot

    LarsB

  • RELEVANCY SCORE 2.41

    DB:2.41:Ipcc 4 Recording Question dc



    Reading the IPCC 4 SRND. Quoted here"The two physical Recording servers work as a single logicalRecording server (a "recording domain") and recording tasks are load balanced in a round robin fashion across the two physical Recording Servers"

    It says using round robin for the recording. Just want to get claricification on this round robin. Per wav file or per supervisor or something else? Thanks

    DB:2.41:Ipcc 4 Recording Question dc

    Hi,

    It is for wav files. Sharing of wave files done with two physical servers in round robin fashion.

    Regards

    Srikanth

  • RELEVANCY SCORE 2.41

    DB:2.41:Vplex Metro In Combination With Vsphere 5.1 (Esxi 5.1) fk



    I have i very simple question.

    what is the Native Multipath Setting on a ESXi 5.1 host when he get its storage from a VPLEX environment.

    (Fixed , Round Robin or something different)

    i looking for a recent document where it is explained.

    DB:2.41:Vplex Metro In Combination With Vsphere 5.1 (Esxi 5.1) fk


    Thanks i configure the NMP with fixed and set preffered path.

  • RELEVANCY SCORE 2.41

    DB:2.41:Auto Assignment By Round Robin 8j



    Hi All,

    did any one try to implement the "Round Robin" for auto assignment.

    Regards,

    Hussam Alshorman

    DB:2.41:Auto Assignment By Round Robin 8j


    This is something I've setup to assign to the analyst with the lowest count. I envisioned it being used from the Self Service side and hidden from users. We would set the flag you see in here to true automatically with a template. Maybe you might find this useful...

    https://landesk.webex.com/landesk/lsr.php?RCID=892c24485cf1461fa11a890d2cacc5cb

  • RELEVANCY SCORE 2.41

    DB:2.41:Thread: Dns Round Robin ac


    We have an F5 load balancer that is using round robin algorithum for our two

    app servers. We want to get rid of the F5\'s and use internal DNS round

    robin...

    I\'m assuming if i make two RR entries for the DNS entry it will work?

    Will the client that goes to app1, always goto app1? how do I set the RR

    record to expire?

    What happens if app1 is down, will the client goto app2 or hang?

    DB:2.41:Thread: Dns Round Robin ac

    In article 5%Poc.10359$Ob.497@prv-forum2.provo.novell.com, John wrote:

    Will the client that goes to app1, always goto app1? how do I set the

    RR record to expire?

    I don\'t see a way to do that. Nor do I know what the default is.

    What happens if app1 is down, will the client goto app2 or hang?

    Well, the DNS server won\'t have a clue as to which machines are up or

    down, so it will give info as if all is well. Beyond that, how the client

    handles not being able to reach an address given to it would be determined

    at the client side, not the DNS server.

    bd

    NSC Volunteer SysOp

  • RELEVANCY SCORE 2.41

    DB:2.41:Iscsi Mpio Throughput Limited To 1g pp



    I have followed the VMware's "iSCSI SAN Configuration Guide" (filename vsp_40_iscsi_san_cfg.pdf) to set up vSphere 4 with software iSCSI MPIO. Round robin is also enabled on the storage to utilize both paths. I can see both paths are active from my Equallogic PS5000X, and are working with active traffic when doing sqoio test. However, the throughput in SQLIO test are maxed out to 1G. Where could the problem be? I imagine the MPIO will result in greater throughput just like what will happen in native Windows set up, but it doesn't seem so.

    DB:2.41:Iscsi Mpio Throughput Limited To 1g pp


    If you are looking for bandwidth testing I'd ditch SQLIO and use IOMeter. Iometer is a very good way to figure out how much data you can fit in each of your 1Gb/s pipes.

    Ben

  • RELEVANCY SCORE 2.41

    DB:2.41:Round Robin On Hp P2000 G3 Fc s1



    Hi.

    Anybody tried round robin path selection policy for HP P2000 G3 FC?

    Thanks

    DB:2.41:Round Robin On Hp P2000 G3 Fc s1


    Hell.

    Why I didn't find that document when searching the internet for hours?

    It seems to answer all my question esp. the one if the iops of 1 which is recommended for EVA is also considered best practise for P2000 G3.

    Thank's a lot for that hint.

    Cheers.

  • RELEVANCY SCORE 2.41

    DB:2.41:Third Party Multipathing Software kk


    Hi, can someone please share some information about this feature - Third Party Multipathing software ?

    I know, this is only available for Vsphere Enterprise Plus edition.

    If, I got with Enterprise Edition, will I not be able to use Power Path OR round robin ? Ideally, I want to use Round Robin so that all the HBA are transferring the traffix.

    What is your suggestion ?

    Thanks

    DB:2.41:Third Party Multipathing Software kk

    If you are having a EMC clarion as a storage for the vsphere enviroment, then you can use the round-robin as your multipathing policy.

    For the IBM DS4800, the vendor specification is to use the MRU as a policy for the better utilization.

    Jay

    MCSE,VCP 310,VCP 410

    Consider awarding points for "helpful" and/or "correct" answers.

  • RELEVANCY SCORE 2.41

    DB:2.41:Round Robin Jms Topic x1



    Is there any support in the JBOSS Jms system for a round robin JMS topic. Such that when a message is consumed, it is consumed by 1 and only 1 of the interested listeners? I have read that this functionality is available in 3rd party JMS providers, but hey why spend money if its freely available.

    DB:2.41:Round Robin Jms Topic x1


    Why not use queues for this? A queue can have several receivers, with messages sent to the first available receiver.

  • RELEVANCY SCORE 2.40

    DB:2.40:Round Robin c1



    How can I use powercli to make all my hosts use round robin on the storage?

    DB:2.40:Round Robin c1


    Discover all Host in vCenter Server and configure Round Robin om disk that do not have Round robin Configured.

    Replace the $clusterName = '*' Variable with a specific clustername if you want to target 1 Cluster in particular

    ==========================

    param(

    [Parameter(Mandatory=$true)]$vCenter,

    $VMhost ="*",

    $clusterName = '*'

    )

    #End Setting Paramters for Scripts

    #Connect to vCenter

    Write-Verbose "Connecting to vCenter"

    $server = Connect-VIServer $vCenter -credential $(get-credential)

    $cluster = Get-Cluster $clusterName

    if (!$cluster) {Write-host -foregroundcolor red "ERROR: ERROR: Cluster $clusterName cannot be found"; exit}

    ForEach ($VMhostname in ($cluster | Get-VMHost -name $VMhost)| sort)

    {

    $VMhostname | Get-ScsiLun -LunType "disk"|where {$_.MultipathPolicy -ne "RoundRobin"} | Set-ScsiLun -MultipathPolicy Roundrobin

    }

  • RELEVANCY SCORE 2.40

    DB:2.40:Round Robin Activity And Incident Assignment 87


    I've seen several threads on auto-assignment to groups or specific users, but was wondering if there is a way to assign incidents round robin?

    DB:2.40:Round Robin Activity And Incident Assignment 87

    Thank u for your response. Appreciate if u could document this. Cheers!Lewis

  • RELEVANCY SCORE 2.40

    DB:2.40:Moh Round Robin? cs



    We have one MRGL, one MRG and two MoH servers as below.

    MRGL -- MRG -- MoH-A and MoH-B

    MoH-A is primary and MoH-B is backup. Just wonder is there any way to run a round robin in this scenario? That is the first caller got ON HOLD will use MoH-A and the second caller got ON HOLD will use MoH-B and so on...

    Thanks.

    DB:2.40:Moh Round Robin? cs


    Unfortunatelly NO, the MRGL will always use the first listed MRG first and if thoese resources are unavailable then it attempts to use the second one. So, it is impossible to play different MOH source from the same device unless one fails.

    Hope, this helps.

    Chris

  • RELEVANCY SCORE 2.40

    DB:2.40:Do All Nodes In A Vsphere Cluster Have To See All Luns? md


    I'm having intermittent problems with a 9-node vSphere cluster that is attached to both an HP EVA and HP MSA SAN.

    EVA works fine, but with MSA we have intermittent problems with SCSI reservation errors. If left, one MSA controller typically ends up crashing.

    I suspect that if fewer nodes were connecting to the MSA LUNs then the SCSI reservation problems might disappear or reduce. The MSA problems only occurred after load and the number of cluster nodes increased.

    So is it okay to present the MSA LUNs to, say, just 4 or 5 of the cluster nodes?

    I'm pretty sure that this would work in the sense that vSphere would be smart enough not to attempt to migrate VMs to nodes that have no access to that VM's files, but perhaps the cluster's DRS and HA logic assume that all LUNs on shared storage are visible to all nodes?

    Obviously I could split the cluster into two halves and present the MSA LUNs to only one, but that seems less flexible.

    The MSA SAN is second-line storage, so I could live with a reduced number of hosts being able to access it.

    Thanks.

    DB:2.40:Do All Nodes In A Vsphere Cluster Have To See All Luns? md


    The reservations you are seen also may exist because you have VMs residing on the MSA luns spreaded to all (or almost all) ESX's. You can try creating 2 clusters, one connected to each SAN (fewer to the MSA, more to EVA, or wathever, depending the number of vms residing on each SAN), and I think you will be resolving your problem in a better way.

    Marcelo Soares

    VMWare Certified Professional 310/410

    Technical Support Engineer

    Globant Argentina

    Consider awarding points for "helpful" and/or "correct" answers.

  • RELEVANCY SCORE 2.40

    DB:2.40:Dns Pool / Round Robin mf





    I am trying to create a dns pool for one domain and they want to do a dns pool/round robin, they are able to manage the dns zone well exept when trying to add 2 cnames containing the same first record.

    irc.domain.ext cname server.domain.ext
    irc.domain.ext cname serve2.domain.ext

    there is any way to manage that in plesk?

    a DNS round robin is where:
    www.foo.com CNAME webserver1.foo.com
    www.foo.com CNAME webserver2.foo.com
    www.foo.com CNAME webserver3.foo.com
    And www.foo.com will go to random address.

    I want to create a DNS pool or DNS round robin.

    Best regards,

    DB:2.40:Dns Pool / Round Robin mf




    In plesk you need to use A records and not cnames.

    www.foo.com IN A 10.0.0.1
    www.foo.com IN A 10.0.0.2
    www.foo.com IN A 10.0.0.3

    -- Matthew



    Originally posted by JLChafardet
    I am trying to create a dns pool for one domain and they want to do a dns pool/round robin, they are able to manage the dns zone well exept when trying to add 2 cnames containing the
    a DNS round robin is where:
    www.foo.com CNAME webserver1.foo.com
    www.foo.com CNAME webserver2.foo.com
    www.foo.com CNAME webserver3.foo.com
    And www.foo.com will go to random address.
    Best regards,

  • RELEVANCY SCORE 2.40

    DB:2.40:What Algorithm To Use In A Round Robin Cpu Scheduling Simulation 8m


    im having problems making my round robin simulation...i think there are ways other than nested loops and data struct..can anyone help me..

    DB:2.40:What Algorithm To Use In A Round Robin Cpu Scheduling Simulation 8m

    Sure, we are all willing to help. But just go ahead and ask your question, you don't need anyone's permission.

  • RELEVANCY SCORE 2.40

    DB:2.40:What Is Round Robin Routing? 91



    Hi,

    I've heard about RIP, IGRP, EIGRP, OSPF, BGP, IS-IS and FRAME RELAY routing but never heard about round robin routing. I've had google about this but not come up with anything related. I would appreciate if anyone could explain what is round robin routing.

    Reference:

    http://homepages.uel.ac.uk/u0223755/Routing%20protocols.htm

    http://hubpages.com/hub/Types-of-Routing-protocol

    Many thanks in advance

    DB:2.40:What Is Round Robin Routing? 91


    Hello Adam,

    we can speak of round robin forwarding that is when multiple paths exist to reach a destination and per packet load balancing is used.

    So round robin routing can be seen as process switching of packets.

    Recent CEF implementations allow to perform per packet load balancing without a need to disable CEF (that is forwearding optimization technique used on Cisco routers and multilayer switches in SW on the first ones  with the help of dedicated hardware on the second ones )

    Standard CEF use per flow load balancing: given a flow with a specific SA and specific IP DA the same path is used for all packets classified on this flow.

    per packet load balancing sends the subsequent packets of the same flow ( IP SA, IP DA) on the different paths and this is a round robin packet forwarding.

    if there are three links:

    packet n.1 goes out link 1

    packet n.2 goes out link 2

    packet n.3 goes out link 3

    packet n. 4 goes out link1

    and so on

    see

    http://www.cisco.com/en/US/tech/tk827/tk831/technologies_tech_note09186a0080094806.shtml

    Then, in other contexts like server load balancing again round robin load balancing can be used in this case each new client TCP connection to the virtual IP address is "routed" to a different real server.

    Hope to help

    Giuseppe

  • RELEVANCY SCORE 2.40

    DB:2.40:Round Robin Lead Assignment s8


    Does CRM On Demand support round robin lead assignment? If not, does anyone know of a method to implement round robin lead assignment within On Demand?

    DB:2.40:Round Robin Lead Assignment s8

    Don, this approach is not round robin but you could setup one user as "round robin" and make a list which other users could then a edit a lead from that list and reassign the ownership to them.

  • RELEVANCY SCORE 2.40

    DB:2.40:Vnx 5300 Performance jm



    Hi,

    I have a VNX 5300 which has the following:

    14 x 7.2k 2TB NS-SAS disks

    21 x 15K 600GB SAS disks

    3 x SSD 100GB

    Vault Drives (Not being used for anything other than Vault)

    The 5 x 2TB and 15 x 600GB are all grouped together in a RAID 5 Storage Pool (FAST VP pool with 100GB FAST Cache and autotiering).

    I have 3 x VMware vSphere 5.1 (HP branded) hosts which share 2 x 2TB Thin LUN's on this pool and connected via software iSCSI.

    Two Cisco 3750G switches are designated only for iSCSI traffic, there's on other connectivity on those switches.

    Each storage processor has 4x 1GB links to the Cisco stack (8x 1GB links for the whole SAN)

    Each server has 4x 1GB links to the Cisco stack via Broadcom NetXtreme BCM5719.

    I am running a simple test, installing Windows 2008 R2 on a virtual machine with 4GB of RAM and one CPU. The time is measured when you click next on the partition screen up to a point when you are asked to change administrator's password.

    Here are my findings:

    1) no jumbo frames, Fixed patch policy on vSphere ESXi 5.0 U1:

    12m 32s

    2) no jumbo frames, Round Robin patch policy on vSphere ESXi 5.0 U1:

    11m 40s

    3) jumbo frames, Round Robin patch policy on vSphere ESXi 5.0 U1:

    9m 33s

    4) jumbo frames, Round Robin patch policy on vSphere ESXi 5.1:

    11m 33s

    For me changing the patch policy and enabling jumbo frames help a lot in terms of performance. I am not sure what happened after updating the whole environment to vSphere 5.1, does someone have similar issue with this version?

    My question is, are those good times? When I do installation on the same server, but to two local 500GB SATA drives in RAID1 (where hypervisor resides), I am done in less than 7 minutes. What else can I do to improve performance and speed? I have a lot of SQLIO test results that I can post.

    DB:2.40:Vnx 5300 Performance jm


    Hi,

    I have a VNX 5300 which has the following:

    14 x 7.2k 2TB NS-SAS disks

    21 x 15K 600GB SAS disks

    3 x SSD 100GB

    Vault Drives (Not being used for anything other than Vault)

    The 5 x 2TB and 15 x 600GB are all grouped together in a RAID 5 Storage Pool (FAST VP pool with 100GB FAST Cache and autotiering).

    I have 3 x VMware vSphere 5.1 (HP branded) hosts which share 2 x 2TB Thin LUN's on this pool and connected via software iSCSI.

    Two Cisco 3750G switches are designated only for iSCSI traffic, there's on other connectivity on those switches.

    Each storage processor has 4x 1GB links to the Cisco stack (8x 1GB links for the whole SAN)

    Each server has 4x 1GB links to the Cisco stack via Broadcom NetXtreme BCM5719.

    I am running a simple test, installing Windows 2008 R2 on a virtual machine with 4GB of RAM and one CPU. The time is measured when you click next on the partition screen up to a point when you are asked to change administrator's password.

    Here are my findings:

    1) no jumbo frames, Fixed patch policy on vSphere ESXi 5.0 U1:

    12m 32s

    2) no jumbo frames, Round Robin patch policy on vSphere ESXi 5.0 U1:

    11m 40s

    3) jumbo frames, Round Robin patch policy on vSphere ESXi 5.0 U1:

    9m 33s

    4) jumbo frames, Round Robin patch policy on vSphere ESXi 5.1:

    11m 33s

    For me changing the patch policy and enabling jumbo frames help a lot in terms of performance. I am not sure what happened after updating the whole environment to vSphere 5.1, does someone have similar issue with this version?

    My question is, are those good times? When I do installation on the same server, but to two local 500GB SATA drives in RAID1 (where hypervisor resides), I am done in less than 7 minutes. What else can I do to improve performance and speed? I have a lot of SQLIO test results that I can post.

  • RELEVANCY SCORE 2.40

    DB:2.40:Round Robin Schduling. 1s


    I want to design a samulation of round robin scheduling. But i am having problems.
    How can i find the starting time of a process and the finishing time of a process.
    Can any body help me in this.
    If any body have the algo of Round robin scheduling please provide me.
    I will be thankful to him/her.

  • RELEVANCY SCORE 2.40

    DB:2.40:Dedicated Configuration Datastore Due To Vsphere Snaphot Block Size Problem jj


    Just upgraded a cluster to ESXi 4, and hit a problem creating snapshots. All VM's have a 80GB OS drive and config files on one of 15 600GB datastores with a 1MB block size. They all have data drive VMDK's of between 1-2TB that reside on one of many 2TB datastores all with 8MB block size. 5 x MSA 2000fc are used for all storage.

    Because of the new snapshot checking in ESX 4 I now get an error whenever I try and create a snapshot as described in the link below. This is due to the inability of the config files datastore to create a file bigger than 256GB, which could happen if the snapshot file grew large due to the larger data drives

    http://kb.vmware.com/selfservice/microsites/search.do?language=en_UScmd=displayKCexternalId=1012384

    I've always kept configuration files with the OS drive for simplicity. However I'm nw considering moving all of the configuration files for ever VM to a dedicated 2TB datastore with 8MB block size. This would resolve the problem without having to reformat the 15 datastores with 1MB block size to 8M,whichwould be painful as they're 80% full with little room to move stuff aroun.

    Is this approach of using a dedicated configuration file sensible, or even desireable? I never overcommit enough to cause any swap activity, but I thought it may be beneficial to keep snapshot IO away from the production VMDK's RAID sets.

    Is there a better way to solve this problem?

    DB:2.40:Dedicated Configuration Datastore Due To Vsphere Snaphot Block Size Problem jj


    I don't know of a way to disable checking, however maybe setting the workingdir for the VM's will work for you..

    I never used this myself, so you will have to find out if and how this fits your needs.

    see also: Creating a snapshot for a virtual machine fails with the error: File is larger than maximum file size supported

    Andr

  • RELEVANCY SCORE 2.40

    DB:2.40:Does S1mq Support Round-Robin Delivery On Queues? k7


    Does S1MQ support round-robin delivery on queues?

    DB:2.40:Does S1mq Support Round-Robin Delivery On Queues? k7

    We're looking at using the Round Robin mode on queues for automatic load balancing with several machines processing messages. Does this sound feasable? I'd be very intesrested if you could provide the specifics alluded to in your message.

    Thanks for your help.

  • RELEVANCY SCORE 2.40

    DB:2.40:Mpio With Esxi 4.1 And Equallogic Ps6000 zk



    I'm trying to set up round robin MPIO in ESXi 4.1 update 1 to my EqualLogic PS6000E running 5.0.7. I do not have ESXi 4.x Enterprise nor Enterprise Plus so I can't use the MPM.

    I've followed TR1049 "Configuring VMware vSphere Software iSCSI With Dell EqualLogic PS Series Storage" (version 1.2) using a 1:1 mapping of vmknics to physical NICs but when I complete the process only a single path per volume appears. I've already double checked that the volume can accept multiple connections per IQN. What else might I do to troubleshoot this?

    DB:2.40:Mpio With Esxi 4.1 And Equallogic Ps6000 zk


    Also, you can use the Dell/EQL HIT kit to enhance MPIO from guest initiated targets. You can created VMPort Groups associated with your iSCSI vSwither and pass them through. This is for Data Volumes only as your OS volumes will sit on the VMFS store you mention above.

  • RELEVANCY SCORE 2.40

    DB:2.40:Md3000i Vs. Hp Msa G2 2312 sf


    If you had the choice of a Dell MD3000i vs. an HP MSA G2 2312, which would you choose for an iSCSI SAN to support 3 vSphere hosts and why?

    Assume that each has the same general configuration: 12 X 15K SAS drives, active/active controller, 3 years 24*7 support.

    DB:2.40:Md3000i Vs. Hp Msa G2 2312 sf


    I do not know HP MSA G2 2312, so I can only say the MD3000i is working fine, multipath is simple (if you follow the suggest network topology), Jumbo Frame are supported (but you have to enable also on storage side) and is quite simple.

    Be sure to have a dual controller, and dedicated switch for iSCSI.

    Is feature of the two storage are similar check the best price

    PS: note that 2,5" disks could be slower than 3.5" (be sure to have same speed).

    Andre

  • RELEVANCY SCORE 2.40

    DB:2.40:Eva Raid Controller Lun 0 Multipath Policy fs



    All of our vSphere 4 update 2 luns are currently set to use round robin except for the controller lun 0 - it is set to fixed. Should lun0 on a eva 8000 /8100 be set to round robin as well? The luns are currently using VMW_SATP_ALUA and the raid controller lun 0 is set to VMW_SATP_EVA psp, is this correct? Thanks in advance.

    DB:2.40:Eva Raid Controller Lun 0 Multipath Policy fs


    1, leave this controller lun to continue to use FIXED

    2, when ESX scans out this lun, it reports not support to ALUA

    3, this is management lun and 0MB in size, not for datastore

    binoche, VCP, CCNA

  • RELEVANCY SCORE 2.40

    DB:2.40:Fifo And Round Robin d3



    Hi, I have a doubt about tasks in fifo and round robind mode.

    The MQXUG says that FIFO and Round Robin mode can work together, so if you want to create a task in round robin mode, you need to set MQX_HAS_TIME_SLICE. Well, If I do it, how can I create a task to work in FIFO mode having MQX_HAS_TIME_SLICE setted?

    I'm a bit confused...

    Thank you

    DB:2.40:Fifo And Round Robin d3


    Hi,

    I meet the same question with you. Now I have addressed it. The step is:

    1) open mqx_install_dir/build/board/uv4/build_libs.uvmpw

    1) add #define MQX_HAS_TIME_SLICE 1 in user_config.h

    2) Bebuild the MQX libraries(Please note that: you should Batch build)

    3) Rebuild your application.

  • RELEVANCY SCORE 2.40

    DB:2.40:Round Robin? xj


    What is round robin? and why ist used?
    Any drawback?

    DB:2.40:Round Robin? xj

    Hi,
    round robin is a load balance technique.
    You will find more information on thishttp://blogs.msdn.com/b/dtaylor/archive/2011/02/23/sharepoint-2010-service-application-load-balancer.aspxandhttp://en.wikipedia.org/wiki/Round-robin_DNS
    Kind regards
    Stefanhttp://www.n8d.at/blog
    Follow me on Twitter: StFBauer |
    n8design
    Microsoft Community Contributor 2011
    MCTS - SharePoint / WSS Configuration and Development

  • RELEVANCY SCORE 2.40

    DB:2.40:Thread: Dns Round Robin For Ldap Server 1p


    Anyone doing a DNS round robin for their Datasync\'s ldap server? We have this setup for other applications and wanted to try this with Datasync.

    Thanks,

    Al

    DB:2.40:Thread: Dns Round Robin For Ldap Server 1p

    Originally Posted by ahidalgo


    Seems to work

    Al

    On 4/2/2012 at 10:11 AM, Al Hidalgoahidalgo@salud.unm.edu wrote:

    Anyone doing a DNS round robin for their Datasync\'s ldap server? We have this setup for other applications and wanted to try this with Datasync.

    Thanks,

    Al



    I have tried this as well, and although I can use the DNS name for our round robin, I find that the server (DS) will attach to the first LDAP server IP address it finds and remain there. I say this because I tried to use the DNS name of the RR and when one of our servers in the RR failed, so did DS. It never attached to the second server. So in my experience it does not work that well.