A virtual machine host is a physical computer that hosts one or more virtual machines. A maintenance host is a virtual machine host that you can dedicate for updating stored resources.
This designation is for reference only; however, by designating and using a dedicated host to perform maintenance tasks, you can avoid affecting the performance and the host rating of a production host while performing such tasks.
For easier administration and for convenience when adding servicing jobs, consider grouping the maintenance hosts.
For more information about maintenance hosts and host groups, see the "About Maintenance Hosts" and "About Host Groups" topics in the Virtual Machine Manager Help.