What does enabling VMware EVC on a cluster ensure?

Enabling VMware Enhanced vMotion Compatibility (EVC) on a cluster is designed specifically to ensure that all hosts within that cluster present a uniform set of CPU features to virtual machines. This uniformity is crucial for seamless vMotion, which allows for the live migration of virtual machines between hosts without downtime.

When EVC is enabled, it allows virtual machines to move freely across hosts that may have different CPU generations or models, as it masks certain CPU features. This prevents CPU compatibility errors that could otherwise occur during such migrations. By ensuring that the CPUs present a consistent set of capabilities, EVC allows for efficient load balancing and resource management without risking compatibility issues when moving workloads.

Other options relate to different aspects of resource management and system recovery. Resource balancing focuses on load distribution across hosts, while quick recovery addresses system resilience and fault tolerance. Aggregation of storage resources pertains to storage management rather than CPU compatibility. Thus, the primary and correct focus of enabling EVC is indeed to avoid CPU compatibility errors during vMotion.