Hitachi Copy-on Write SnapShot, User Manual, Page: 47 / 90

Using SnapShot
6–5
Hitachi Simple Modular Storage Copy-on-Write SnapShot User’s Guide
2. From the Replication tree, select the Local Replication icon. The Pairs
screen displays.
3. Select the pair that you want to update and click the Resync Pair button
at the bottom of the screen. The operation may take several minutes,
depending on the amount of data.
4. When the Resync is completed, click the Split Pair button. This
operation is completed quickly. When finished, the V-VOL is updated.
•
Restore the P-VOL from the V-VOL
SnapShot allows you to restore your P-VOL to a previous point in time from
any SnapShot image (V-VOL). The amount of time it takes to restore your
data depends on the size of the P-VOL and the amount of data that has
changed.
When you restore the P-VOL, two processes *take place.
• The V-VOL is validated to insure that the restoration will complete
successfully. During the validation stage, the host cannot access the P-
VOL. Once validation is complete, the P-VOL is again available.
• The restoration takes place. The actual copying from V-VOL to P-VOL is
performed in the background. The P-VOL is available for read/write
from the host during the restoration.
To restore the P-VOL from the V-VOL
1. Shut down the host application.
2. Un-mount the P-VOL from the production server.
3. In the Storage Navigator 2 GUI, select the
Local Replication icon in the
Replication tree view.
Advanced users using the Navigator 2 CLI, please refer to
Restoring V-
VOL to P-VOL on page A-6 .
4. In the GUI, select the pair to be restored in the Pairs list.
5. Click Restore Pair. View subsequent screen instructions by clicking the
Help button.
Restore from Tape
You can restore the P-VOL from tape directly or indirectly, as follows:
• If the V-VOL is in Failure status.
• Data pool capacity
NOTE: Differential data is deleted from the data pool when a V-VOL is
updated. The deletion may take a few moments.