A host can be a member of at most one host group. To move a host from one host group to another, you must first remove it from its current host group before you can add it to another host group.
If a host is mapped to one or more volumes and you move the host from one host group to another, the mappings specific to the host are retained but mappings associated with the host group from which the host was moved are not retained. Instead, the host inherits any mappings associated with the new host group to which it is moved.
If you move a host from a host group that has no mappings and that has host members without specific mappings, the host group and hosts are moved to the default storage domain.
For example, suppose that two host groups are created on an array, Host Group 1 and Host Group 2. Host Group 1 has three member hosts: Host1, Host2, and Host3. Host Group 1 has no mappings, and Host1 is the only of its hosts with any mappings. Host Group 2 has two member hosts: Host4 and Host5. Host Group 2 is mapped to one volume, and Host4 and Host5 have no specific mappings.
When you move Host1 from Host Group 1 to Host Group 2, the following occurs:
To add hosts to or remove hosts from a host group:
The Array Summary page is displayed.
The Volume Summary page for that array is displayed.
The Host Group Summary page is displayed.
The Host Group Details page is displayed.
The Add/Remove Host Group Members page is displayed.
The Host Group Summary page is displayed with the updated information.