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# Edit CKD volume capacities

A storage volume is an identifiable unit of data storage. Storage groups are sets of volumes.

## Prerequisites

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

## Steps

1. Select the storage system.
2. Select Hosts > Mainframe > Create.
3. Click to open the Edit Volume Capacities dialog.
4. Use the drop-down menus to choose the number of volumes, the model, the capacity, and the unit to be used to measure capacity (TB, GB, MB, or cylinders). Click to add another volume size.
5. Click Apply to apply your changes or Cancel to reject them.