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# Copy CU image mapping

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

## Prerequisites

Before you begin:

All volumes in a specified range must be mapped to the same CU image, or not mapped at all. Volumes within the specified range that are not mapped are ignored if they are not mappable (SAVE devices, DRVs, and so on). If a volume in the specified range is mappable, the request is rejected.

## About this task

The following steps explain how to copy the front-end mapping addresses of a set of volumes from one port to another, providing multi-path access from the storage system to the mainframe.

To copy CU image mapping:

## Steps

1. Select Hosts > CU Images to open the CU Images list view.
2. Select an image, and click Copy Mapping to open the z/OS Map dialog box.

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