HP StorageWorks XP Remote Web Console Software - Manual (Page 11)

2 About XP Snapshot Operations
When XP Snapshot is used, it creates pairs consisting of a P-VOL and an S-VOL. When creating a pair,
XP Snapshot uses a V-VOL as the S-VOL of the pair. In addition, the snapshot data of the P-VOL can be
managed by copying the data to the area called a pool. This chapter describes the volumes used by
XP Snapshot first, and then describes the functions of XP Snapshot.
XP Snapshot Component
A system using XP Snapshot usually contains the following components.
• Pair of volumes (P-VOL and S-VOL)
• XP Snapshot program product
• Licensed Business Copy program product
• HP StorageWorks XP RAID Manager
Volumes and Volume Pairs
XP Snapshot copies the original data in a P-VOL to a V-VOL which is specified as an S-VOL, and
manages the normal volume and the virtual volume as a pair. The differential data between the P-VOL
and the S-VOL will be stored in a pool-VOL as snapshot data. Therefore, you need at least one normal
volume as a copy source (P-VOL), one V-VOL as a copy target (S-VOL), and one pool-VOL where you
can store snapshot data.
XP Snapshot Software
You can operate XP Snapshot by using the HP StorageWorks XP Remote Web Console computer.
The Remote Web Console computer is connected to the Storage systems via the TCP/IP local-area
network (LAN). The Remote Web Console computer communicates and exchanges data directly with the
service processor (SVP) of the connected subsystems. You can then acquire the information about the
configuration or status of the subsystem, or issue commands to the subsystem.
License
You need to install the program product of Business Copy in the Remote Web Console computer before
you operate XP Snapshot. In addition, in order to create XP Snapshot pairs, you need to purchase the
Business Copy license and make sure that there is enough licensed capacity according to the capacity
of the pairs you are going to create.
Business Copy license capacity includes:
• XP Snapshot P-VOLs
• XP Snapshot pool-VOLs
• Business Copy P-VOLs
• Business Copy S-VOLs
• Business Copy reserved volumes
These volumes are called used volumes. When you decide how much license capacity you should
purchase, you need to make sure there will be enough licensed capacity for these used volumes. You
must hold down the total capacity of the used volumes so that it will be equal to or less than the
licensed capacity.
XP24000 Snapshot User's Guide 11