Setting up the environment for Open HyperSwap

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You must set up an environment in which you can run Open HyperSwap® processing before you can enable Open HyperSwap for a IBM® Copy Services Manager session.

About this task

Complete the following steps before you enable Open HyperSwap.

Procedure

  1. Ensure that the IBM AIX® hosts and IBM DS8000® meet the following hardware and software requirements:
    AIX requirements
    You can find the supported AIX version for each Copy Services Manager release in the support matrix at http://www-01.ibm.com/support/docview.wss?uid=ssg1S1005402. Click the link for the applicable release under Agents, Servers, and Browsers.
    You must have the following AIX modules installed:
    • Subsystem Device Driver Path Control Module (SDDPCM) version 3.0.0.0 or later
    • Multi-Path Input/Output (MPIO) module (the version that is provided with AIX)
    IBM DS8000 hardware requirements
    The Open HyperSwap function requires IBM DS8000 5.1 or later.
    You cannot use Open HyperSwap with High Availability Cluster Multi-Processing (HACMP).
  2. Create connections from Copy Services Manager to the AIX hosts by following the instructions at Adding a host system connection.
  3. Assign copy set volumes from the storage device to the host by using the IBM DS8000 command-line interface (CLI) or the graphical user interface (GUI).
  4. Run the AIX cfgmgr command to discover the volumes that are assigned to the host.

What to do next

Considerations for Open HyperSwap and the AIX host:
  • A single session that has the Open HyperSwap function enabled can manage multiple hosts; however, each host can be associated with only one session. Multiple hosts can share the session.
  • For AIX 5.3, a single host can manage a maximum of 1024 devices that are enabled for Open HyperSwap processing on the host. A maximum of eight logical paths can be configured for each copy set in the session. For AIX 6.1, a single host can manage a maximum of 1024 devices that are enabled for Open HyperSwap processing on the host. A maximum of 16 logical paths can be configured for each copy set in the session.
  • If an application on the host opened a device, a Copy Services Manager session for that device cannot be ended. The Terminate command fails. To end the session, you must either close the application or remove the copy sets from the session. If you remove copy sets from the session, you must ensure that the application writes the data to the correct volume when the copy set relationship is restored.
  • Open HyperSwap processing can fail on a subset of hosts for the session and continue to run on the remaining hosts for the same session. In this situation, you must determine the best action to take if the application is writing data to volumes on the source system and to volumes on the target system.
  • To enable Open HyperSwap processing on the host, see the IBM System Storage Multipath Subsystem Device Driver User's Guide.