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# View CKD volumes in CU image

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

## Prerequisites

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

## About this task

To view CKD volumes in CU image:

## Steps

1. Select the storage system.
2. Select Hosts > CU Images.
3. Select the CU image and click .
4. In the details panel, click the number in the Number of Volumes field to open the CKD Volumes list view.
5. Use the CKD Volumes list view to display and manage CKD volumes in a CU image.

   Name—Volume name.

   Type—Volume configuration.

   Status—Volume status.

   Capacity (GB)—Volume capacity in GBs.

   Emulation—Emulation type.

   UCB Address—Unit control block (address used by z/OS to access this volume).

   Volser—Volume serial number (disk label (VOL1) used when the volume was initialized).

   The following controls are available:

   —View CU image details

   z/OS Map— z/OS map from the volume list view

   z/OS Unmap— z/OS unmap from the volume list view

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