HP StorageWorks Snapshot XP user guide (December 2005)

22 Snapshot XP
Remote Web Console to delete pairs. For more information about each operation, see ”Snapshot XP
operations” on page 18.
NOTE:
• Before creating a pool, the virtual volume management area must be created in shared memory. Virtual
volume management areas are automatically created when additional shared memory is installed. For
more information about installing additional shared memory, contact your HP Account Support
Representative.
• If any pools or Snapshot XP pairs are already created for testing purpose before you actually start using
Snapshot XP for production purpose, HP recommends that you initialize the V-VOL management area
beforehand. For more information, see ”Initializing V-VOL management areas or pool management
blocks” on page 39.
You do not always need to delete Snapshot XP pairs after storing snapshot data in the pool. However,
since one P-VOL can be paired with up to 64 S-VOLs, you must delete the snapshot data or unnecessary
pairs. When you delete a Snapshot XP pair, the pair’s snapshot data is also deleted from the pool.
If a failure occurs when you restore a Snapshot XP pair, the pair’s snapshot data is written back to the
P-VOL. You might not be able to restore the pair if another pair is being restored.
For more information about the status of Snapshot XP pairs and operations on pairs, see ”Status of
Snapshot XP pairs” on page 22.
Status of Snapshot XP pairs
When you create or split a Snapshot XP pair, the pair status changes. Figure 4 shows the transitions of the
Snapshot XP pair status.
Figure 4 Snapshot XP pair status transitions