HP StorageWorks XP Remote Web Console Software - Manual (Page 8)

2 About XP Snapshot Operations
This chapter describes the volumes used by XP Snapshot and the functions of XP Snapshot.
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“XP Snapshot Components” (page 8)
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“XP Snapshot Operations” (page 9)
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“Status of the XP Snapshot Pairs” (page 14)
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“Copy Threshold Option” (page 25)
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“Interoperability with Other Products and Functions” (page 26)
XP Snapshot Components
A system using XP Snapshot usually contains the following components.
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Pair of volumes (P-VOL and S-VOL)
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Consistency group
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XP Snapshot program product
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Licensed XP Business Copy program product
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XP RAID Manager
Volumes and Volume Pairs
XP Snapshot copies the original data in a P-VOL to a V-VOL. A V-VOL is specified as an S-VOL
and manages a P-VOL. A P-VOL is the logical volume and an S-VOL, which is the V-VOL, is the
volume for an XP Snapshot pair.
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A virtual volume of XP Thin Provisioning Software can be specified as a logical volume, but
a virtual volume of XP Snapshot should not be specified.
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The differential data between the P-VOL and the S-VOL will be stored in a pool volume as
snapshot data. Therefore, you need at least one logical 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.
Volume Pairs and Consistency Group
You can define plural XP Snapshot pairs as one consistency group by using RAID Manager. When
you store snapshot data by consistency group, data is copied as of the same point in time for all
P-VOLs in the group.
XP Snapshot Software
You can operate XP Snapshot by using the 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 systems. You can then acquire the information about the
configuration or status of the system, or issue commands to the system.
License
You need to install the XP Business Copy license in the Remote Web Console computer before you
operate XP Snapshot. In addition, to create XP Snapshot pairs, you must purchase the XP Business
Copy license and ensure that there is enough licensed capacity for the pairs you are going to
create.
8 About XP Snapshot Operations