To improve CPU compatibility between hosts that have varying CPU feature sets, you can hide some host CPU features from the virtual machines by placing the host in an Enhanced vMotion Compatibility (EVC) cluster. Using EVC prevents migrations with vMotion from failing because of incompatible CPUs. EVC ensures that all hosts in a cluster present the same CPU feature set to virtual machines, even if the actual CPUs on the hosts differ. You can use the Enhanced vMotion Compatibility (EVC) feature to help ensure vMotion compatibility for the hosts in a cluster. Processors within a given family generally have similar feature sets. A mismatch between two hosts' kernel-level features blocks migration only when the virtual machine has access to a feature that the target host does not provide. Without the use of EVC, any mismatch between two hosts' user-level features blocks migration, whether or not the virtual machine itself has access to those features. VCenter Server's CPU compatibility checks compare the CPU features available on the source host, the subset of features that the virtual machine can access, and the features available on the target host.
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VMware, in partnership with CPU and hardware vendors, is working to maintain vMotion compatibility across the widest range of processors. Note: You can hide Host CPU features from a virtual machine by applying a custom CPU compatibility mask to the virtual machine, but this is not recommended.
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