Which feature must be enabled to set up vSphere Proactive HA?

To successfully set up vSphere Proactive High Availability (HA), vSphere DRS (Distributed Resource Scheduler) must be enabled. This is essential because Proactive HA functions by integrating with vSphere DRS to maintain a consistent level of performance and availability for virtual machines in a cluster. When DRS is active, it monitors the resource utilization of virtual machines and can automatically migrate workloads to other hosts during maintenance events or when hardware issues are identified, thus supporting the proactive nature of Proactive HA.

The relationship between DRS and Proactive HA is crucial. DRS is responsible for load balancing and resource management within the cluster, which allows Proactive HA to effectively respond to environmental changes and hardware conditions. Without DRS, Proactive HA would lack the necessary workload management capabilities to react appropriately to potential system risks or impacts on performance.

The other features mentioned do not directly support the functionality of Proactive HA in the same way. While vSphere HA is vital for maintaining availability during host failures, it does not inherently manage resource allocation as DRS does. Cluster EVC (Enhanced vMotion Compatibility) ensures compatibility of CPU generations in the cluster, but it does not impact fault tolerance or proactive management. Fault Tolerance provides continuous availability by creating a live shadow