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# Unmap CKD volumes

Count Key Data (CKD) volumes are used for mainframe storage.

## About this task

The following explains how to unmap CKD volumes from ESCON/FICON ports.

You can perform this operation at the volume level or the CU image level.

## Steps

1. Select the storage system.
2. - To unmap at the volume level:
     1. Select Storage > Volumes.
     2. To display only CKD volumes, click in the Emulation field and select CKD from the drop-down menu.
     3. Select a CKD volume, click , and click z/OS Unmap to open the z/OS Unmap Volumes dialog box.
   - To unmap at the CU image level:
     1. Select Hosts > CU Images to open the CU Images list view.
     2. Select an image and click z/OS Unmap to open the Unmap CU Image dialog box.
3. Type or Select the Volume Range to be unmapped.
4. Type or Select the Base Address.
5. Type or Select an SSID.
   Valid SSIDs must only have unmapped volumes using them, and the number of volumes cannot exceed 256.
6. Select the Port to which you want to map the volumes.
7. 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.