HP StorageWorks XP Remote Web Console Software - Manual (Page 12)

RAID Manager
Part of XP Snapshot operations require RAID Manager. When you use RAID Manager, you do not need
to use the Remote Web Console computer. Instead, you operate XP Snapshot directly from the host
by executing the commands.
XP Snapshot Operations
This section describes the main operations of XP Snapshot.
Create V-VOL Management Area Operation
A V-VOL management area needs to be created in the shared memory before you use XP Snapshot. The
V-VOL management area is an important area for associating an S-VOL (a V-VOL) of XP Snapshot with a
pool-VOL. The V-VOL management area is created automatically when the additional shared memory is
installed. Please call HP technical support for the installation of additional shared memory.
There are two kinds of areas in the V-VOL management area: pool management block and pool
association information. When you create pools or XP Snapshot pairs, the pool management block or
pool association information will be stored in the V-VOL management area; therefore, the available
capacity of the V-VOL management area decreases. When all capacity of the V-VOL management area
is used, the capacity ratio of the pool management block and the pool association information in the
V-VOL management area will be fixed. If the capacity of the pool management block is insufficient,
problems may occur; for example, you cannot create new pools or create pools with a large amount of
capacity. To solve such problems, you need to initialize the V-VOL management area. For details, see
“ Initializing V-VOL Management Area or Pool Management Block ” on page 57.
Creation of a Pool
An XP Snapshot pool is an area to store snapshot data. A pool consists of multiple pool-VOLs, and
snapshot data is stored in a pool-VOL. 256 pool-VOLs can be registered in a pool, and 32 pools can be
created in a storage system. Figure 2 on page 12 illustrates the relationship between an XP Snapshot
pair and a pool.
Figure 2 The Mechanism of an XP Snapshot Pair and a Pool
You need to create a pool when you use XP Snapshot. Pool-VOLs registered in a pool can be added
but cannot be deleted during the operation. In addition, all snapshot data in the pool needs to be
deleted if you want to delete the pool itself.
12 About XP Snapshot Operations