FT virtual machines in a cluster that is enabled with vSphere DRS do not function correctly if Enhanced vMotion Compatibility (EVC) is currently disabled.

Problem

Because EVC is a prerequisite for using DRS with FT VMs, DRS does not place or evacuate them if EVC has been disabled (even if it is later reenabled).

Cause

When EVC is disabled on a DRS cluster, a VM override that disables DRS on an FT VM might be added. Even if EVC is later reenabled, this override is not canceled.

Results

If DRS does not place or evacuate FT VMs in the cluster, check the VMs for a VM override that is disabling DRS. If you find one, remove the override that is disabling DRS.

Note:

For more information on how to edit or delete VM overrides, see vSphere Resource Management.