Updating The V-Vol - Hitachi AMS2100 User Manual

Updating the V-VOL

NOTE: Differential data is deleted from the data pool when a V-VOL is
updated. Time required for deletion of pool data is proportional to P-VOL
capacity and P-VOL-to-V-VOL ratio. For a 100 GB P-VOL with a 1:1 ratio, it
takes about five minutes. For a ratio of 1 P-VOL to 32 V-VOLs, deletion time
is about 15 minutes.
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Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
Updating the V-VOL means to take a new snapshot. Two steps are
involved when you update the V-VOL: resynchronizing the pair and
then splitting the pair.
• Resynchronizing is necessary because after a pair split, no new
updates to the P-VOL are copied to the V-VOL. When a pair is
resynchronized, the V-VOL becomes a virtual mirror image again
of the P-VOL.
• Splitting the pair completes of the snapshot. The V-VOL and the
P-VOL are the same at the time the split occurs. After the split
the V-VOL does not change. The V-VOL can then be used for
tape-backup and for operations by a secondary host.
To update the V-VOL
(For instructions using CLI, see
CLI on page B-15.)
1. In Navigator 2 GUI, select the desired array, then click the Show
& Configure Array button.
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.
•
Using SnapShot
Updating SnapShot Logical Unit using