sargey
Contributor
Contributor

CPU model Does not Match

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?

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7 Replies
Linjo
Leadership
Leadership

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

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DavoudTeimouri
Virtuoso
Virtuoso

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.

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sargey
Contributor
Contributor

Thanks for the reply Davoud.

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

Capture.JPG

Does this look correct?

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DavoudTeimouri
Virtuoso
Virtuoso

Hi,

Select "Nehalem" and check again.

Davoud.

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sargey
Contributor
Contributor

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

Would the hosts need a reboot?

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DavoudTeimouri
Virtuoso
Virtuoso

No need to restart.EVC applying on cluster.

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Linjo
Leadership
Leadership

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

Best regards, Linjo Please follow me on twitter: @viewgeek If you find this information useful, please award points for "correct" or "helpful".
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