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

To set up vSphere Proactive HA, vSphere DRS (Distributed Resource Scheduler) must be enabled. Proactive HA is a feature designed to increase availability by automatically evacuating virtual machines from hosts that are predicted to have issues based on health status or other monitoring data. For Proactive HA to function effectively, it relies on the workload management capabilities provided by vSphere DRS.

With DRS enabled, the cluster can make intelligent decisions about resource allocation and virtual machine placement, enhancing the overall efficiency and availability of applications running in the virtual environment. Furthermore, DRS works in conjunction with vSphere HA to allow for automated resourcing under distress conditions, increasing resilience against host failures.

Other features such as vSphere HA are indeed necessary for basic high-availability operations, but they do not provide the proactive capacity to predict and address issues before they lead to failures. Cluster EVC is designed for CPU compatibility but does not relate directly to the proactive capabilities of resource management. Fault Tolerance allows for the continuous availability of a VM but doesn't incorporate proactive monitoring and resource management features.

This is why vSphere DRS is the critical component that must be enabled for setting up Proactive HA, as it provides the necessary framework for resource management and load balancing