Be aware not all CPU's are compatible for VMotion. If you have hosts on different hardware make sure they are compatible to use the Vmotoin and saveyourslf a lot of problems!!

See the document at VMare what Processors are compatible: read more

The presentation from VMworld 2006 VMotion between apple and Oranges

CPU masking doesn't happen when you cold migrate - CPU masks only take effVmotion ect when the machine is powered on and when you do a VMotion.

Cold migrate is a general work around when CPU incompatiabilites occour...

There is a legend in the VI Client for the CPU Identification Mask Legend
VM -> Edit Settings -> Options -> Advanced -> Advanced -> Legend

Download an application to gather all Information of the installed CPU's from Run-Virtual