- Place the host in maintenance mode
This will result in the host not being used by DRS. However it also means the host won’t be used by HA and you cannot run any workloads on it.
- Create “VM/Host” affinity rules and exclude the host that needs to be DRS disabled. That way all current workloads will not run, or be considered to run, on that particular host. If you create “must” rules this is guaranteed, if you create “should” rules then at least HA can still use the host for restarts but unless there is severe memory pressure or you hit 100 CPU utilization it will not be used by DRS either.
- Disable the vMotion VMkernel interface
This will result in not being able to vMotion any VMs to the host (and not from the host either). However, HA will still consider it for restarts and you can run workloads on the host, and the host will be considered for “initial placement” during a power-on of a VM.
Original post by Duncan Epping from yellow-bricks.com