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You can set a cpu mask on your VMs so that these type of cpu incompatibilities are ignored in the pre-vmotion checks
In the VI client, rt click on the VM, edit settings, select the "options" tab, click on advanced, then look in the CPU Identification Mask
You can just mask the NX flag - or you can mask other advanced features (search the vmtn forums and/or google for more info)
thanks for your response!
i found out that shuting down the gues OS, then the ESX server itself, then enabling the BIOS setting and starting up again does the trick. no CPUID mask needed.
That's OK if all your hardware supports the same cpu settings - obviously if they are all the same - then there are no compatabilities to mask.
If some ESX hardware supports some cpu functionality, and some doesn't - that is when you do need to mask out the incompatabilities