What does enabling VMware EVC on a cluster ensure?

Enabling VMware Enhanced vMotion Compatibility (EVC) on a cluster is specifically designed to ensure that all hosts within the cluster present a consistent CPU feature set to the virtual machines (VMs). This alignment is essential for seamless vMotion operations, which allow VMs to be migrated between hosts without downtime. When EVC is activated, the cluster will mask incompatible CPU features on hosts that may cause compatibility issues for VMs during migration, thus preventing CPU compatibility errors. This consistent feature set enables VMs to operate on any host within the EVC-enabled cluster without the risk of encountering issues due to differing CPU capabilities.

Regarding the other options: resource balancing is managed by Distributed Resource Scheduler (DRS), quick recovery relates more to fault tolerance and high availability configurations, and the aggregation of storage resources pertains to storage policies and vSAN rather than EVC. Therefore, ensuring compatibility for vMotion through EVC is the primary and correct focus of this feature.