In vSphere 6.7 U2, VMware's large Remote Office Branch Office (ROBO) Enterprise license supports automatic VM evacuations when a host enters maintenance mode.
In a ROBO Enterprise cluster, DRS is disabled by default and you cannot make changes to DRS configuration. When a host in a ROBO Enterprise cluster enters maintenance mode, VMs are automatically evacuated from the host by DRS. Before evacuating the VMs from the host, DRS creates VM-host affinity mappings to track where the VMs were placed. When the host exits maintenance mode, the VMs that were running on the host are migrated back to the host. VM-host affinity mappings are cleared after the migration.