VMware Enhanced vMotion Compatibility (EVC} different CPU generations.

Описание: VMware Enhanced vMotion Compatibility (EVC) is a cluster feature that creates a consistent CPU feature set across different CPU generations, allowing seamless live migration (vMotion) of virtual machines between hosts with older and newer processors in the same cluster, simplifying hardware upgrades without downtime by hiding advanced features beyond a selected baseline. It ensures VMs see the same CPU capabilities regardless of the host they're on, enabling easier scaling and hardware refresh cycles by standardizing CPU feature exposure.

|| How it works
_CPU Normalization: EVC normalizes CPU features to the lowest common denominator within the cluster, effectively masking newer features from VMs.

__Baseline Selection: You select an EVC baseline (e.g., a specific Intel or AMD CPU generation) in the cluster settings.

__Host Compatibility: Only hosts compatible with that baseline can join the cluster, preventing new, incompatible hardware from breaking vMotion.

__Per-VM EVC: (Introduced in vSphere 6.7) Allows individual VMs to override the cluster baseline for more granular control, useful for migrations across different vCenter systems.

|| Key benefits
__Simplified Upgrades: Add new, faster servers to a cluster and migrate workloads to them without powering VMs down.

__Seamless Mobility: VMs can move freely between hosts with different CPU hardware.

__Reduced Complexity: Manages CPU compatibility automatically, preventing vMotion failures due to mismatched CPU instruction sets.

|| Requirements
__All hosts in an EVC cluster must be from the same CPU vendor (Intel or AMD).

__Hardware virtualization (Intel VT-x or AMD-V) and No-Execute (NX/XD) must be enabled in the host BIOS.

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