Maintenance mode for a virtual machine allows you to halt a host anytime you need to perform maintenance tasks on the physical host, such as applying security updates or replacing hardware on the physical host computer. If you have not Virtual Machine Manager, you can put the node in pause to trigger the draining mode which move all resources associated to the host. You can trigger the maintenance mode from Failover Cluster MMC, VMM and Windows Admin Center.

The advantage of using VMM is that the maintenance mode is also set in Operations Manager to avoid to raise alerts.