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# Map CKD volumes

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

## About this task

The following explains how to map CKD volumes to ESCON or FICON ports.

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

## Steps

1. Select the storage system.
2. Complete one of the following steps:
   - To map 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 Map to open the z/OS Map Volumes dialog box.

     | NOTE: To create a CU image, enter a base address with a four-hexadecimal format, for example "3210". "32" is the CU Image ID. "10" is the base address. The first base address must end with 0. To create an SSID, enter an SSID with a four-hexadecimal format, for example "1234". The SSID must be unique.

   - To map at the CU image level:
     1. Select Hosts > CU Images.
     2. Select an image and click z/OS Map to open the z/OS Map dialog box.
3. Type or Select a Volume Range.
4. Type the Base Address to be assigned to the first volume in the mapping request.
   Base addresses increase incrementally by one for each volume in the range of volumes being mapped. To view base addresses already in use, click Show.
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. Click 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.

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