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  • 1.  CPU model Does not Match

    Posted Apr 05, 2013 01:34 PM

    I have 2 ESXi 5.1 boxes, both Dell PowerEdge T610's.

    One has Xeon E5620 and the other has Xeon E5520.

    When I try and turn on FT, I get the message "The cpu pair is not compatible for fault tolerance: CPU model does not match".

    Does it have to be the exact same CPU type to enable FT?



  • 2.  RE: CPU model Does not Match

    Posted Apr 05, 2013 02:14 PM

    FT is much more picky about CPU models the vMotion and HA, so I would say that yes you will need the same CPU model.

    // Linjo



  • 3.  RE: CPU model Does not Match

    Posted Apr 08, 2013 09:35 AM

    Hi,

    You should use EVC mode on your cluster on this regard, EVC mode allow your virtual machines to use some of standard CPU features family and when you have two different CPU on your hosts, you have to check your old CPU kernel name and configure EVC according to that. New features on your new CPU will not accessible by your VMs and vMotion, HA and FT will be enabled for you.

    Davoud.



  • 4.  RE: CPU model Does not Match

    Posted Apr 08, 2013 09:39 AM

    Thanks for the reply Davoud.

    I have EVC enabled on the cluster and think that it's configured correctly. (See screenshot)

    Does this look correct?



  • 5.  RE: CPU model Does not Match

    Posted Apr 08, 2013 10:24 AM

    Hi,

    Select "Nehalem" and check again.

    Davoud.



  • 6.  RE: CPU model Does not Match

    Posted Apr 08, 2013 11:07 AM

    No, still get "CPU model does not match" message.

    Would the hosts need a reboot?



  • 7.  RE: CPU model Does not Match

    Posted Apr 08, 2013 11:19 AM

    No need to restart.EVC applying on cluster.



  • 8.  RE: CPU model Does not Match

    Posted Apr 08, 2013 12:12 PM

    Not 100% sure but I don't think that EVC can solve CPU Compatibility for FT.

    Your CPU:s need to match for it to work.

    Are you also aware of the 1 vCPU limitation with FT?

    // Linjo