Restoring Thin Image Advanced pairs

Thin Image Advanced User Guide
Version
9.8.6
Audience
anonymous
Part Number
MK-98RD9033-00

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

To restore a Thin Image Advanced pair, the pair must be in the PSUS status. When the restoration is completed, the status of the Thin Image Advanced pair changes to PSUS and the snapshot data is restored to the status when it was stored.

CAUTION:
If a failure occurs during restoration, the pair status becomes PSUE. To restore a Thin Image Advanced pair in the PSUE status, you need to delete the snapshot data of the pair. However, when you restore the Thin Image Advanced pair in the PSUE status by deleting the snapshot data, the data in the P-VOL of the pair is not guaranteed. For this reason, you need to overwrite the P-VOL with backup data or format the P-VOL. Because the pair status is PSUE if a failure occurs during pair restoration, restoration using the snapshot data of the applicable S-VOL is not possible. However, you can restore the P-VOL if the failure does not affect other snapshot data as shown in the following example: The capacity runs out while copying metadata for restoring a pair and the status of only the target pair changes to PSUE.
  • You must have the Storage Administrator (Local Copy) role.
  • The Thin Image Advanced pair must be split ("PSUS" status).

Restoring pairs using CCI commands

The following is an example of restoring snapshot data for the P-VOL (LDEV number 10:10) of MU number 10:

raidcom modify snapshot -ldev_id 0x1010 -mirror_id 10
-snapshot_data restore

Restoring pairs using HDvM - SN

  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 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 Advanced pair is restored ("PAIR" status).