- At the primary site, bring up the host. Make sure that TC components are operational.
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Run the CCI pairresync -swaps command to the S-VOL.
If the pair data flow is already set in the opposite direction and the pair is in PAIR or COPY status, the pairresync -swaps needs not to be run.If a failure occurs after the one volume capacity of a TC pair can be expanded, the swap resync operation of the TC pair cannot be performed because the capacity of both the volumes is not the same. Make sure to expand the other volume capacity so that the capacity of both the volumes is the same, and then retry the operation.
- At the secondary system, halt host operations and vary the P-VOL (old S-VOL) offline. This maintains synchronization of the pairs.
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Run the
horctakeover command to the P-VOL.
If a failure occurs after the one volume capacity of a TC pair can be expanded, the swap resync operation of the TC pair cannot be performed because the capacity of both the volumes is not the same. Make sure to expand the other volume capacity so that the capacity of both the volumes is the same, and then retry the operation.
- Verify the primary system and P-VOLs online, and start host operations at the primary site.