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Failover Modes with VNX and VMware
Hi
We have multiple VNX 5500 running Flare Code 32. Vmware 4.1 runs on these arrays and wanted to know what fail-over mode should be set. Currently it is set to Failover mode 1. Should it be set to Failover mode 4?
What would be the benefits of moving to Failover mode 4?
dynamox
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March 7th, 2013 06:00
Christopher explains it in great details
Failover mode and Initiator Type best Practices for VNX5300 VSphere 5 iSCSI
kelleg
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March 8th, 2013 14:00
Failover mode for for ESX 4.x and higher and VNX flare code 31 and higher should always be set to 4 (ALUA).
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glen
christopher_ime
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March 11th, 2013 03:00
Daniel,
emc99467: "What are the Initiator, Arraycommpath, and Failovermode settings for PowerPath, DMP, PVLinks, and native failover software?"
[...]
ESX 4.0 or above:
• Failovermode recommended to be set to 4 for ALUA behavior or
• Failovermode may be set to 1 for active/passive behavior
[...]
Keep in mind though since you are running ESX v4.1 by not running with FM 4, you are giving up the VAAI support.. This is a requirement to obtain the hardware offload support.
Having said that though, keep in mind unless you are running the latest version (released towards the end of February) VNX OE for Block 05.32.000.5.201, we are suggesting that you temporarily disable the XCOPY VAAI primitive until you can upgrade.
emc313487: "Extended Copy (XCOPY) VAAI Primitive not behaving as expected with VNX OE Release 32"
mattyboy1
6 Posts
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March 11th, 2013 03:00
Thanks for that. We have upgraded to Flare 32 two weeks ago, so I think I need to arrange to Fail-over mode 4. If i remember correctly this is a disruptive change and need to restart the VM servers.
mattyboy1
6 Posts
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March 11th, 2013 03:00
Many thanks for your assistance. Can you also confirm what the impact would be for running in failover mode 1.
Daniel
dynamox
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March 11th, 2013 04:00
yes, anytime you change failover mode you have to reboot the host