Releasing the differential data managed in a pool

When a UR pair contains a DP-VOL that is larger than 4,194,304 MB (8,589,934,592 blocks), the differential data is managed by the pool to which the pair is related. If differential data management fails due to insufficient pool capacity, you need to release the differential data (pages) managed in the pool. You also need to release pages when you downgrade to a microcode version that does not support UR pairs with volumes larger than 4,194,304 MB.

Procedure

  1. Delete all UR pairs that use the V-VOL for which you want to release the pages by using the pairsplit -S command.

  2. Make sure that system option mode 755 is set to OFF. When system option mode 755 is set to ON, you cannot reclaim zero pages. For details about setting system option modes, contact your Hitachi Solution Support Center representative.

  3. Restore the blocked pool. For details, see the Provisioning Guide.

  4. Release the V-VOL pages by using the raidcom modify ldev command. Releasing pages might take some time. For details, see the Provisioning Guide.

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