HP XP Business Copy Software - Manual (Page 10)

storage system rejects all write operations to reserved volumes, except when the pair is in PSUS
or PSUS(SP) status. For details about pair status, see
“XP Business Copy Pair Status” (page 22) .
You can reserve up to 16,384 volumes in one storage system.
Create Pair Operation
To create an XP Business Copy pair, the P-VOL must be in SMPL status. You may set a reserve
attribute on the S-VOL before creating a pair. You can also create a pair with an unreserved SMPL
volume. For details about how to create XP Business Copy pairs, see
“Creating Pairs” (page 68)
and “Performing Pair Creation and Pair Splitting” (page 79) .
You can specify up to three S-VOLs for one XP Business Copy P-VOL and create three pairs. In
addition, the XP Business Copy cascade function allows you to create a second layer of up to two
S-VOLs for each S-VOL in the first layer. Pairs created between the first and second layer are called
cascaded pairs.
Figure 2 (page 11) illustrates cascaded XP Business Copy pairs.
10 About XP Business Copy Operations