HP StorageWorks XP Remote Web Console Software - Manual (Page 14)

Figure 1 Business Copy Components
You operate Business Copy from the Remote Web Console computer, and copy volumes in the storage
system. A volume that has original data is called a P-VOL, and a volume to which the data is copied
is called an S-VOL. A pair of the P-VOL and the S-VOL made by Business Copy is called a Business
Copy pair.
Note that you may operate Business Copy directly from the host if you use RAID Manager. For details,
see “ RAID Manager ” on page 15.
Volume Pairs and Consistency Groups
Business Copy performs internal copy operations for logical volume pairs established by the user.
Therefore, Business Copy needs at least two volumes, one for the copy source (P-VOL) and the other for
the copy target (S-VOL). Each P-VOL can have up to three S-VOLs.
The Business Copy P-VOLs are the primary volumes that contain the original data. The Business Copy
S-VOLs are the secondary volumes that contain the backup data. Each S-VOL must be paired with only
one P-VOL. During Business Copy operations, the P-VOLs remain available to all hosts for read and write
I/O online operations (except during reverse copy and quick restore operations). When the pair status
is PAIR and if the P-VOL is updated, the differential data between P-VOL and S-VOL will be copied to
the S-VOL regularly. However, since Business Copy S-VOLs are updated asynchronously, the P-VOL and
S-VOL of the pair in PAIR status may not be identical. Remember that the S-VOLs become available
for host access only after the pair has been split.
14 About Business Copy Operations