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# Modify host groups

Storage hosts are systems that use storage system LUN resources. A logical unit number (LUN) is an identifier that is used for labeling and designating subsystems of physical or virtual storage.

## Prerequisites

See Roles and associated permissions to determine the user roles that can perform this task.

## About this task

To modify a host group:

## Steps

1. Select the storage system.
2. Select Hosts > Hosts .
3. Do one of the following:
   - Modifying host groups:
     - Select the host and click Modify to open the Modify Host Group dialog box.
     - To change the hostname, select it and type a new name over it. Hostnames must be unique from other hosts on the storage system and cannot exceed 64 characters. Only alphanumeric characters, underscores ( _ ), and (-) are allowed. Host names are case-insensitive.
   - Adding initiators:
     - In the Select Initiators list box, type the initiator name or select it from the list. To filter the list, type part of an initiator name.

       | NOTE: Initiators can only belong to one host at a time; therefore, any initiators that do not appear in the list already belong to another host.

     - The Add Initiators table is a filtered list that is based on whether the host is Fibre Channel or iSCSI or NVMe/TCP.
     - Select an initiator from the Available Initiators list and click .
     - Repeat these steps for each additional initiator.
     - To add a user-defined initiator to the host, click , type the name and click OK.
   - Removing initiators:
     - In the Initiators in Host list, select the initiator and click .
     - Repeat these steps for each additional initiator.
4. Do one of the following:
   - Click Run Now to perform the operation now.
   - Expand Run Now and click Add to Job List to add this task to the job list, from which you can schedule or run the task at your convenience. For more information, see Schedule jobs and Preview jobs.