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

pool management block and pool association information in the V-VOL management area is fixed. If the
pool management block's capacit y is insufficient, problems might occur. For example, you cannot create
pools or pools with a large capacit y. To solve such problems, initialize the V-VOL management area. For
more information, see Initializing V-VOL management areas or pool management b locks.
Creating pools
A pool is an area where the snapshot data tha t Snapshot XP obtains is stored. A pool consists of
multiple pool-VOLs, and snapshot data is stored in a pool-VOL. You can register 1,024 pool-VOLs in a
pool. You can
create 128 pools in an array. Figure 2 illustrates the relationship between Snapshot XP
pairs and pools.
Figure 2 Snapshot XP pair and pool m ec h anism
You must create a pool when using Snapshot XP. You can ad d pool-VOLs registered in a pool, but
cannot delete pool-VOLs during the operation. In addition, to delete the pool itself, you must del
ete
all snapshot data in the pool.
CAUTION:
A pool's capacity equals the total capacity of the pool-VOLs registered in the pool. T he Snapshot XP
pair's status is PSUE (status when failure occurred) when the pool's usage rate exceeds the pool's
capacity as a result of writing data in that pair's volume. You cannot store Snapshot data in the pool,
and you c annot create Snapshot XP pairs. For more information about ensuring sufficient pool capacity,
see Notes on creating pools.
To create a pool, use the Pool pane in Command View XP or XP Remote Web Console. For more
information, see Creating or deleting pools.
Creating virtual volumes
A V-VOL is a virtual volume define d in a VDEV. You must create a V-VOL before you create a Snaps hot XP
pairbecauseyoumustuseaV-VOLastheSnapshotXPpair'sS-VOL.
AV-VOL'sdefinition cannot be released if the V-VOL is being used as a Snapshot XP pair's S-VOL. To
release the definition, d elete the Snapshot XP pair using the V-VOL.
HP StorageWorks Snapshot XP user guide
17