HP StorageWorks XP Snapshot Software user guide: HP XP12000, HP XP10000, HP 200 Storage Virtualization System (T1713-96026, March 2009)

management area is automatically created when additional shared memory is installed. For more
information about shared memory requirements, see Table 4 on page 19. To install additional shared
memory, contact your HP account support representative.
There are two areas in the V-VOL management area: pool management block and pool association
information. When creating pools or XP Snapshot pairs, the pool management block or pool association
information is stored in the V-VOL management area. Therefore, the V-VOL management area's
available capacity decreases. When all the V-VOL management area's capacity is used, the capacity
ratio of the 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” on page 56.
Creating pools
A pool is an area where the snapshot data that XP Snapshot 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 on page 13 illustrates the relationship between
XP Snapshot pairs and pools.
Figure 2 XP Snapshot pair and pool mechanism
You must create a pool when using XP Snapshot. 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.
XP Snapshot User Guide 13