Configuring a system for an IBM Z host

Configure a DS8000 storage system for an IBM Z host by creating count key data (CKD) pools, logical subsystems (LSSs), and volumes. After you complete these steps, configure the host to connect to the volumes.

1. Create a pair of CKD pools, one for each processor node, by using the Create Pool Pair action in the Arrays by Pool page.
   The DS8000 Storage Management GUI automatically creates a pair of pools, which balances the workload between the two nodes.
2. In the Create Pool Pair window, select the number of arrays that you want to assign to the pool pair, according to your performance needs as determined in the storage planning process.
   If you have multiple drive classes on your storage system, decide how many of each drive class you want in each pool. An array consists of eight drives. The DS8000 Storage Management GUI configures the selected arrays for CKD storage and distributes them evenly between the two pools.
   Note: If you prefer to balance arrays manually, you can use the Assign action in the Arrays by Pool page.
3. Create CKD volumes by using the Create Volumes action in either the Volumes page or the Volumes by Pool page. Use the quick volume creation option to conveniently create volumes with standard provisioning and to create aliases. Use the custom volume creation option to create volumes with thin provisioning and specify logical subsystems (LSSs). For more information, see Creating volumes for IBM Z hosts by using quick creation or Creating volumes for IBM Z hosts by using custom creation.
4. Add aliases, also known as parallel access volumes (PAVs).
   PAVs enable concurrent write operations to the same volume.

   • If Dynamic PAV or HyperPAV are enabled on the storage system, add aliases to the LSS.
   • If Dynamic PAV and HyperPAV are not enabled, add aliases to the volumes that require them.

   You can add aliases by using one of the following options:

   • The quick volume creation option in Create Volumes window, which is available from the Create Volumes action in either the Volumes page or the Volumes by Pool page.
   • The Manage Aliases action, which is available by selecting a volume on the Volumes, Volumes by Pool,Volumes by LSS, and Volumes by Host pages. This action is also available by selecting an LSS on the Volumes by LSS page.
   For more details about aliases and the procedures for configuring them on an IBM Z host, see the online product documentation about PAVs.
5. Set the I/O port protocols of the I/O ports that the host uses to communicate with the storage system. Use the Modify I/O Port Protocols action on the System page to set the I/O port protocol to FICON®.
6. If you are using a zHyperLink connection, use the zHyperLink tab on the System page to enable the connection.
   Note: By default, the zHyperLink facility is disabled in z/OS®. To enable z/OS for zHyperLink read or write processing, use the SETIOS MVS™ system command after an IPL, or use the IECIOSxx PARMLIB to enable zHyperLink processing during IPL.

   SETIOS MVS Command

   To enable zHyperLink read and write processing on the IBM z host system after an IPL, enter the following MVS commands:

   SETIOS ZHPF=YES
   SETIOS ZHYPERLINK,OPER={READ|WRITE|ALL}

   For more information about the SETIOS MVS command, refer to the z/OS MVS System Commands.

   IECIOSxx parmlib

   To enable zHyperLink read and write processing during an IPL, include the following statements in the IECIOSxx PARMLIB member on the IBM z host system:

   ZHPF=YES
   ZHYPERLINK,OPER={READ|WRITE|ALL}

   For more information about the IECIOSxx PARMLIB member, refer to the z/OS MVS Initialization and Tuning Reference.

7. Configure the host so that it connects to the new CKD volumes on the storage system.