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# Edit storage group volume details

Storage groups are a collection of devices that are stored on the storage system. An application, a server, or a collection of servers use them.

## About this task

To edit storage group details for a storage system:

## Steps

1. Click the Volume Configuration tab.
2. To name the volumes you are adding to the storage group, select one of the following Volume Identifiers and type a Name.

   | NOTE: This option is only available when modifying storage groups with new volumes. If you are modifying storage groups with some new and some existing volumes, apply the identifiers only to the new volumes.

   - None—Allows the system to name the volumes (Default).
   - Name Only—All volumes have the same name.
   - Name + VolumeID—All volumes have the same name with a unique volume ID appended to them. With this option, the maximum number of characters that are allowed is 50.
   - Name + Append Number —All volumes have the same name with a unique decimal suffix appended to them. The suffix start with the value that is specified for the Append Number and increment by 1 for each additional volume. Valid Append Numbers must be from 0 to 1000000. With this option, the maximum number of characters that are allowed is 50.
3. Data reduction is enabled by default on All Flash systems running the HYPERMAX OS 5977 Q3 2016 Service Release or later. To disable it for this storage group, clear the Enable Data Reduction check box. For more information about data reduction, see Understanding data reduction.
4. Optional: Click the Enable Mobility ID checkbox to assign Mobility IDs to the volumes in the storage group. If you leave the checkbox empty, Compatibility IDs are assigned to the volumes instead.
5. Optional: Click Allocate capacity for each volume checkbox.
6. Optional: Click Persist preallocated capacity through reclaim or copy checkbox.
7. Click the Volume Size tab.
8. Enter a volume size, capacity, and capacity unit.
9. Optional: Add one or more volume sizes by hovering over the area to the right of the volume capacity and selecting .
10. Optional: Click to remove a volume size.
11. Click Apply.
    The Storage Group page in the wizard displays Mixed Capacities for the row. Click Mixed Capacities to reopen this dialog.