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TryllZ
Expert
Expert

Different CPU for vMotion ?!

Hi,

I'm trying to understand what has to be different in CPU for vMotion to fail.

Is it the the architecture or series as in VMware HCL, or anything else.

As the below 2 CPU are exactly the same but are different models, so who would I know if vMotion will work ?

Intel Xeon E5-2680 vs Intel Xeon E5-2690: What is the difference? (versus.com)

Its exactly the same even on Intel's site..

https://www.intel.com/content/www/us/en/products/sku/64583/intel-xeon-processor-e52680-20m-cache-2-7...

https://www.intel.com/content/www/us/en/products/sku/64596/intel-xeon-processor-e52690-20m-cache-2-9...

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2 Replies
a_p_
Leadership
Leadership

It's the CPU's feature set that makes the difference.

A VM that has been powered on on a newer CPU model cannot be vMotion'd to a host that does not support those CPU features. Allowing such a life migration would most likely cause the VM to panic/blue screen.

In order to avoid such situations, EVC comes into play. Setting the EVC mode on the cluster level to the common (i.e. the oldest CPU model) makes sure that regardless on which host a VM is powered on, only the CPU feature for the selected EVC mode will be presented to the VM.

André

TryllZ
Expert
Expert

Thanks a lot @a_p_ for clarifying that..

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