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# z/OS unmap from the volume list view

Unisphere supports the z/OS unmapping of CKD volumes.

## Prerequisites

Before making any mapping changes to an existing CU image, ensure that all the devices in the CU are offline (the status of the CU should be offline).

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

## About this task

To unmap a CU image (from the volume list view):

## Steps

1. Select the storage system.
2. Select Hosts > Mainframe to open the mainframe dashboard.
3. Click CKD Volumes.
4. Select one or more volumes to unmap, click and then click z/OS Unmap.
   The Mainframe Volumes Unmapping dialog box displays a summary of the unmap operation.
5. 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.