When configuring a cluster in a vSphere environment, what must be true for EVC functionality?

For Enhanced vMotion Compatibility (EVC) functionality in a vSphere environment, it is essential that only hosts of the same processor family are included in the cluster. This requirement is crucial because EVC allows for the migration of virtual machines across hosts by ensuring that the CPU features available to the virtual machines are consistent across all hosts in the cluster.

When hosts belong to the same processor family, they share compatible instruction sets and feature sets, which enables vMotion to operate smoothly without encountering issues related to differing CPU capabilities. This consistency is vital for maintaining virtual machine compatibility and performance during live migrations and failovers.

In contrast, having hosts from different processor families can lead to compatibility issues, as some hosts may support features that others do not, potentially causing operational disruptions. Thus, including hosts of the same processor family guarantees a stable and reliable environment for virtual machine migrations.

Other options, while potentially related to cluster configuration or management, do not directly pertain to the core requirements for EVC functionality, which focuses specifically on the compatibility of CPUs within the EVC enabled cluster.