HP StorageWorks Snapshot XP user guide (T1713-96023, October 2006)

NOTE:
• Before creating a pool, you must create the virtual volume management a rea in shared memory.
Virtual volume management areas are automatically created when you install additional shared
memory. For more information about installing additional shared memory, contact your HP account
support representative.
• If you already cre ated pools or Snapshot XP pairs for testing purposes before you actually start using
SnapshotXPforproductionpurposes,HPrecommendsinitializingtheV-VOLmanagementarea
beforehand. For more information, see Initializing V-VOL management areas or pool management
blocks.
You d o 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 d elete the snapshot data or unnecessary
pairs. When deleting a Snapshot XP pair, the pair's snapshot data is also deleted from the pool.
If a failure occurs when restoring a Snapshot XP pair, the pair's snapshot data is written back to the
P-VOL. You m ight not be able to restore the pa ir 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.
Status of Snapshot XP pairs
When creating or splitting a Snapshot XP pa ir, the pair status changes. Figure 4 shows the transition of
the Snapshot XP pair status.
Figure 4 Snapshot X P pair s ta tus transition
1. IfavolumeisnotassignedtoaSnapshotXPpair,itsstatusisSMPL.
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Using Snapshot XP