Topic
  • 7 replies
  • Latest Post - ‏2012-10-23T11:33:52Z by Berniebgbb
Peasty
Peasty
5 Posts

Pinned topic DS3500 multipathing for ESXi 5.0 U1

‏2012-10-22T01:10:04Z |
We have a new DS3524 and 2 x ESXi 5.0 U1 hosts.
DS3500 is running 7.83.22 and we have Storage Manager 10.83 configured.

In choosing the host type for ESX host logical drives, can we now select VMWareTPGSALUA, or should we still be using VMWARE?
And following on, if VMWareTPGSALUA is correct, should the ESX multipathing policy be Round-Robin?

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2016753

Many thanks,
Peter
Updated on 2012-10-23T11:33:52Z at 2012-10-23T11:33:52Z by Berniebgbb
  • Novikov_Alexander
    Novikov_Alexander
    1404 Posts

    Re: DS3500 multipathing for ESXi 5.0 U1

    ‏2012-10-22T18:19:08Z  
    Dear Peter,

    there is info in readme file for 7.83 firmware:

    "Provide support for Asymmetric Logical Unit Access (ALUA) failover method
    for storage subsystems with controller firmware versions 7.83.xx.xx and
    higher installed. Currently, this failover method is supported for
    Microsoft Windows 2003 or 2008, Linux RH 6.2 and later and SLES11 SP2 and
    later, VMWare ESX4.1 U3 and later and ESXi5.0 U1 and later, Solaris 11, HP-
    UX and MacOS operating system (OS) environments when an appropriate ALUA
    host type is selected for the defined host and an ALUA-supported multipath
    driver is installed in the host."

    Regards,
    Alexander Novikov
    Russia, Moscow
  • Peasty
    Peasty
    5 Posts

    Re: DS3500 multipathing for ESXi 5.0 U1

    ‏2012-10-22T22:46:48Z  
    Dear Peter,

    there is info in readme file for 7.83 firmware:

    "Provide support for Asymmetric Logical Unit Access (ALUA) failover method
    for storage subsystems with controller firmware versions 7.83.xx.xx and
    higher installed. Currently, this failover method is supported for
    Microsoft Windows 2003 or 2008, Linux RH 6.2 and later and SLES11 SP2 and
    later, VMWare ESX4.1 U3 and later and ESXi5.0 U1 and later, Solaris 11, HP-
    UX and MacOS operating system (OS) environments when an appropriate ALUA
    host type is selected for the defined host and an ALUA-supported multipath
    driver is installed in the host."

    Regards,
    Alexander Novikov
    Russia, Moscow
    Hi Alexander,

    Many thanks for your quick response.
    The second part of my question related to multipathing policy for the ESXi hosts...

    For an active-passive SAN, using VMWARE host type, the preferred policy was MRU.
    Now that we have active-active with ALUA support, is ROUND-ROBIN the preferred policy, or is it still MRU?

    VMware point us to the storage vendor for this advice. The 7.83 readme doesn't mention this, and the 10.8 Storage Manager Guide (Second Edition, September 2012) is not up to date - i.e. it doesn't mention ALUA as supported for DS3500 with ESX.

    VMware multipathing policies:
    http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1011340

    cheers,
    Peter
  • Novikov_Alexander
    Novikov_Alexander
    1404 Posts

    Re: DS3500 multipathing for ESXi 5.0 U1

    ‏2012-10-23T04:27:02Z  
    • Peasty
    • ‏2012-10-22T22:46:48Z
    Hi Alexander,

    Many thanks for your quick response.
    The second part of my question related to multipathing policy for the ESXi hosts...

    For an active-passive SAN, using VMWARE host type, the preferred policy was MRU.
    Now that we have active-active with ALUA support, is ROUND-ROBIN the preferred policy, or is it still MRU?

    VMware point us to the storage vendor for this advice. The 7.83 readme doesn't mention this, and the 10.8 Storage Manager Guide (Second Edition, September 2012) is not up to date - i.e. it doesn't mention ALUA as supported for DS3500 with ESX.

    VMware multipathing policies:
    http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1011340

    cheers,
    Peter
    Hi Peter,

    info about multipathing policy for the ESXi hosts with ALUA mode on DS systems are missed in docs. Call to you local IBM representative and ask him.

    Regards,
    Alexander Novikov
    Russia, Moscow
  • tbastia
    tbastia
    20 Posts

    Re: DS3500 multipathing for ESXi 5.0 U1

    ‏2012-10-23T10:27:45Z  
    Hi Peter,

    info about multipathing policy for the ESXi hosts with ALUA mode on DS systems are missed in docs. Call to you local IBM representative and ask him.

    Regards,
    Alexander Novikov
    Russia, Moscow
    You should not use round robin on DS arrays.
    see http://blogs.vmware.com/vsphere/2012/02/configuration-settings-for-alua-devices.html
  • tbastia
    tbastia
    20 Posts

    Re: DS3500 multipathing for ESXi 5.0 U1

    ‏2012-10-23T11:09:28Z  
    • tbastia
    • ‏2012-10-23T10:27:45Z
    You should not use round robin on DS arrays.
    see http://blogs.vmware.com/vsphere/2012/02/configuration-settings-for-alua-devices.html
    ALUA does not make the DS an active-active array it is still an active-passive, if you use round robin, it will not use the standby path, standby is for failover. If you have more than one active path, round robin will switch between active paths. The question that I do not know the answer to is. Is it best practice to present DS storage to a host with more than 2 paths? I know it works with windows but it was not best practice. I think it would work to present storage so that each HBA had a path to both controllers. Then use round robin and ESXi should use both HBA's.
  • tbastia
    tbastia
    20 Posts

    Re: DS3500 multipathing for ESXi 5.0 U1

    ‏2012-10-23T11:22:11Z  
    • tbastia
    • ‏2012-10-23T11:09:28Z
    ALUA does not make the DS an active-active array it is still an active-passive, if you use round robin, it will not use the standby path, standby is for failover. If you have more than one active path, round robin will switch between active paths. The question that I do not know the answer to is. Is it best practice to present DS storage to a host with more than 2 paths? I know it works with windows but it was not best practice. I think it would work to present storage so that each HBA had a path to both controllers. Then use round robin and ESXi should use both HBA's.
    More reading shows best pratice is for 4 paths for each lun on ESXi, each HBA requires access to each controller, and I think it would be best to use round-robin. This would make better use of HBA queues.
  • Berniebgbb
    Berniebgbb
    83 Posts

    Re: DS3500 multipathing for ESXi 5.0 U1

    ‏2012-10-23T11:33:52Z  
    • tbastia
    • ‏2012-10-23T11:22:11Z
    More reading shows best pratice is for 4 paths for each lun on ESXi, each HBA requires access to each controller, and I think it would be best to use round-robin. This would make better use of HBA queues.
    F.Y.I

    We run our own site, and many of our customer have also adopted Round Robin with ALUA. No problems here.

    Bernie.