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In order for the switchover operation to succeed four settings must be configured:

1. clustering must be active on the node that currently controls the IASP.

2. all disk units in the IASP must be configured for the HyperSwap relationship.

3. all of the HyperSwap relationships in the IASP must be synchronized.

4. every HyperSwap relationship in the IASP must be replicating in the same direction. All disk units must have the same primary DS8000.

If these conditions are not in place, the HyperSwap switchover operation will fail.

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The diagrams below depict the stages of a HyperSwap switchover in an environment with Global Mirror replication.

1. Begin with the environment in normal operation as described above.

2. Type in the following command to initiate a switchover from DS8000 A to DS8000 B.

   Code Block
   CHGHYSSTS OPTION(*SWAP) NODE(NODE_1) ASPDEV(IASP_1)

   This indicates to PowerHA that the user wants to swap the HyperSwap relationship, changing the primary from DS8000 A to DS8000 B.

3. The command switches the HyperSwap primary from DS8000 A to DS8000 B with near-zero downtime.

4. PowerHA switches the Global Mirror link to keep the Global Mirror replication from the primary, now DS8000 B to DS8000 C.

Result

The switchover should complete successfully. Use the DSPHYSSTS to confirm the changes.

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Figure 1. HyperSwap switchover within a HyperSwap with Global Mirror configuration:

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