What action can an administrator expect DRS to take in a vSphere cluster after a host failure with HA and DRS enabled in fully automated mode?

When a host fails in a vSphere cluster where both High Availability (HA) and Distributed Resource Scheduler (DRS) are enabled in fully automated mode, the expected behavior is that HA will first handle the recovery of the affected virtual machines. HA will restart these VMs on another host within the same cluster that has available resources.

After the HA has completed the restart of the virtual machines, DRS then takes over to ensure optimal resource usage across the cluster. Its role involves balancing the load and performance of the virtual machines. The procedure allows DRS to take into account the resource needs of the VMs that have just been restarted and places them on hosts that can adequately support them, within the same cluster.

This process ensures high availability of the VMs while also maintaining efficient resource utilization as managed by DRS, reinforcing the effectiveness of having both HA and DRS policies in place. It does not involve the relocation of the VM to a different cluster, as both the restart and the initial resource allocation is managed within the constraints of the same cluster.