vCenter Server performs compatibility checks before it allows migration of running or suspended virtual machines to ensure that the virtual machine is compatible with the target host.
vMotion transfers the running state of a virtual machine between underlying ESXi systems. Live migration requires that the processors of the target host provide the same instructions to the virtual machine after migration that the processors of the source host provided before migration. Clock speed, cache size, and number of cores can differ between source and target processors. However, the processors must come from the same vendor class (AMD or Intel) to be vMotion compatible.
Migrations of suspended virtual machines also require that the virtual machine be able to resume execution on the target host using equivalent instructions.
When you initiate a migration with vMotion or a migration of a suspended virtual machine, the Migrate Virtual Machine wizard checks the destination host for compatibility and produces an error message if compatibility problems will prevent migration.
- Host CPU family and model
- Settings in the BIOS that might disable CPU features
- ESX/ESXi version running on the host
- The virtual machine's compatibility setting
- The virtual machine's guest operating system