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Implementing VMware vCenter Server by Konstantin Kuminsky

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EVC mode

Before vCenter Server allows migration of running or suspended VM from one host to another, it performs a number of compatibility checks to make sure that this virtual machine will be able to resume or keep running on the new host.

One of the requirements is CPU compatibility, that is, the processor on the target host should be able to provide the same set of features to the VM after migration. This CPU feature set is determined based on the following items:

  • Host CPU family and model
  • CPU features that are available based on the settings in BIOS
  • The ESX/ESXi version running on the host
  • The virtual machine's virtual hardware version
  • The virtual machine's guest operating system

The reason for the last requirement is that when a virtual machine ...

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