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Friday, June 5, 2009

vSphere vMotion error : Mismatched Host CPU features

It seems that after upgrading a Virtual Machine’s hardware from Version 4 to Version 7 on vSphere, the VM may no longer be able to vMotion between hosts (Even identical ones).
Refer to KB article 1993 for possible solutions
As detailed in the following KB article, after upgrading the VM’s hardware version, there may be artificial CPU MASKS applied to the VM.
KB Article : 1011294
VMware Advanced CPU Masks
Clicking ‘Reset to Default’ cleared the unnecessary masks and vMotion capabilities were restored.
During the upgrade process of Virtual Hardware while the machine is powered down, be sure to clear the CPU Masks.
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