Configuring DS8000 HyperSwap with independent auxiliary storage pools (IASPs)

IASP-based HyperSwap® enviroments require both HyperSwap and logical unit number (LUN) switching configuration.

These steps assume the user has experience configuring and managing an IBM® System Storage® DS8000®. For information about using an IBM System Storage DS8000 unit, see Copy Services in the IBM System Storage DS8000 Information Center.

If necessary, use HyperSwap independently as a disk protection solution in a single-system environment without any LUN configuration. This has limited uses.

Inside a high availablity environment with IASPs, both HyperSwap and LUN switching must be configured. The IASPs in the HyperSwap configuration require LUN volume groups separate from any of the SYSBAS LUNs. Any secondary IASPs in the same HyperSwap relationship associate with the primary IASP only. Primary and secondary IASPs cannot split into separate relationships. Other primary IASPs or user defined file system (UDFS IASP) outside of the HyperSwap environment have seperate defined relationships.

IBM i high availability solutions using DS8000 HyperSwap automatically detect the HyperSwap IASPs after the DS8000 is configured appropriately.

To configure HyperSwap for use with IASPs, follow these steps:

Create LUNs on the source DS8000 system.
Assign those LUNs on the source DS8000 to the System i® partition.
Note: The IASP LUNs must be in separate volume groups from any SYSBAS LUNs, on both the source and target DS8000.
Create LUNs on the target DS8000 but do not assign them to the IBM i until after the Metro Mirror has been configured.
Note: The IBM i device driver ensures data consistency for HyperSwap switchover and failover operations. Do not use Metro Mirror consistency groups here.
Configure Metro Mirror between the source and target DS8000 with the mkpprcpath command on the DS8000 from the DSCLI.
Start Peer-to-Peer Remote Copy (PPRC) with the mkpprc command on the DS8000 from the DSCLI.
Assign the LUNs on the target DS8000 to the same IBM i partition.
Verify the HyperSwap configuration with the Display HyperSwap Status (DSPHYSSTS) command. The status of the HyperSwap drive pairs configured should display in the DSCLI
If your established HyperSwap environment requires additional disk units for more cacpacity, complete the following procedure to add units to an existing IASP in a HyperSwap environment:
1. For new disk units to be added to the IASP, pause PPRC with the pausepprc command on the DS800 from the DSCLI
2. Stop replication with the Change HyperSwap Status command, CHGHYSSTS OPTION(*STOP) ASPDEV(iasp-name).
3. Add the new units to the IASP with the System Service Tools (STRSST) command.
4. Resume replication with the Change HyperSwap Status command, CHGHYSSTS OPTION(*START) ASPDEV(iasp-name).
The expanded storage in your HyperSwap environment on your IBM i partition is configured for switching.