Restoring Thin Image pairs

Thin Image User Guide
Version
9.8.6
Audience
anonymous
Part Number
MK-98RD9020-16

Restoring a Thin Image pair overwrites the existing P-VOL data with the differential data on the S-VOL.

Restoration of a Thin Image pair may end abnormally in either of the following conditions:

  • You are storing snapshot data for a consistency group that already includes the pair.
  • You are using the P-VOL of the pair as the P-VOL of another Thin Image pair and you are storing snapshot data for a consistency group including the latter pair.

For Thin Image pairs where the cascade attribute is enabled, the information displayed in Synchronization Rate (%) of the View Pair Synchronization Rate window, or the information displayed by the raidcom get snapshot command varies depending on the pair status. For details, see View Pair Synchronization Rate window.

CAUTION:
Failures can occur while restoring Thin Image pairs, which suspends the pairs ("PSUE" status).

For more information about restoring suspended Thin Image pairs, see Restoring suspended Thin Image pairs.

The amount of time required for restoration depends on the following, even if the pair synchronization rate is 100 percent:

  • The amount of capacity the pool is using.
  • The number of pairs being resynchronized concurrently.

For Thin Image pairs where the cascade attribute is enabled, the information displayed in Synchronization Rate (%) of the View Pair Synchronization Rate window, or the information displayed by the raidcom get snapshot command varies depending on the pair status. For details, see View Pair Synchronization Rate window.

Note: The pair synchronization rate may not change when you view the rate while restoring the Thin Image pair. To view the up-to-date rate, wait until the task has completed.

For more information about monitoring the pair synchronization rates, see Viewing pair synchronization rates.

Note: If the amount of snapshot data in selected P-VOLs or the total number of pairs in selected snapshot groups exceeds 32,768, an error message appears when attempting to perform pair tasks.

If you use CCI commands, see Pair tasks using CCI or Device Manager - Storage Navigator.

  • You must have the Storage Administrator (Local Copy) role.
  • The Thin Image pair must be split ("PSUS" status).
  1. In the Explorer pane, click Storage Systems, expand the storage system tree, expand Replication, and then click Local Replication.
  2. In the Local Replication window, select a P-VOL in the TI Root Volumes tab or a snapshot group in the Snapshot Groups tab.
  3. Click Operate TI Pairs.
  4. In the TI Pairs window, select the pairs you want to resynchronize, and then click Resync Pairs. You can specify P-VOLs until the number of snapshots or clones reaches 32,768. You can also specify snapshot groups until the number of pairs reaches 32,768. For cascaded pairs with layers, specify pairs at the lowest layer, and then higher layers.
  5. For Resync Type, select Reverse Copy (Secondary > Primary) for a full restoration of P-VOL data from the S-VOL.
  6. Click Finish, and then confirm the settings.
  7. Accept the default task name or enter a unique name.
    You can enter up to 32 letters, numbers, and symbols, except the following:

    \ / : , ; * ? " < > |

  8. If you want to monitor the task after submitting it, select Go to tasks window for status.
  9. Click Apply to submit the task.
The Thin Image pair is restored ("PAIR" status).
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