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Hosts with Different Hardware
If you move a virtual machine to a host with significant hardware differences, the guest operating system may no longer work correctly.
Moving Between 64-bit and 32-bit Hosts
Moving a virtual machine from a 64-bit host to a 32-bit host can require that you recompile the kernel in your Linux guest operating system.
Moving from a Multiprocessor Host to a Uniprocessor Host
If you move a virtual machine created in VMware ESX Server on a multiprocessor host to a uniprocessor host, the guest operating system consumes 100% of the host CPU's processing capacity, even when the guest operating system is essentially idle. To prevent this, change the setting for numvcpus from 2 to 1 in the virtual machine configuration .vmx file.