HP StorageWorks XP Remote Web Console Software - Manual (Page 17)

pool management block and pool association information in the V-VOL management area is fixed. If the
pool management block's capacity is insufficient, problems might occur. For example, you cannot create
pools or pools with a large capacity. To solve such problems, initialize the V-VOL management area. For
more information, see Initializing V-VOL management areas or pool management blocks .
Creating pools
A pool is an area where the snapshot data that 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 mechanism
You must create a pool when using Snapshot XP. You can add pool-VOLs registered in a pool, but
cannot delete pool-VOLs during the operation. In addition, to delete the pool itself, you must delete
all snapshot data in the pool.
CAUTION:
A pool's capacity equals the total capacity of the pool-VOLs registered in the pool. The 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 cannot 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 defined in a VDEV. You must create a V-VOL before you create a Snapshot XP
pair because you must use a V-VOL as the Snapshot XP pair's S-VOL.
A V-VOL's definition cannot be released if the V-VOL is being used as a Snapshot XP pair's S-VOL. To
release the definition, delete the Snapshot XP pair using the V-VOL.
HP StorageWorks Snapshot XP user guide 17