HP XP Business Copy Software - Manual (Page 30)

30 Business Copy XP (BC) for the XP128/XP1024
NOTE: After the pairsplit, response time of the first I/O to each logical unit (LU) can be up to
approximately five seconds in the worst case. This worst case should be in a one-to-three BC pair situation
and 36 LDEV LUSE configuration.
Pair status
The BC remote console software displays the pair status of all BC volumes (LUs) on the specified port of the
connected disk array. The following figure shows the BC pair status transitions and the relationship
between pair status and BC operations.
Figure 9 BC pair status transitions
The following describes BC pair status conditions:
1. If a volume is not assigned to a BC pair, its status is SMPL.
2. Select the SMPL volumes for the P-VOL and S-VOL to create a BC pair. When you create a BC pair, the
initial copy operation starts. During the initial copy operation, the status of the P-VOL and S-VOL
changes to COPY(PD).
3. When the initial copy operation is complete, the pair status becomes PAIR. When the pair status is
PAIR, the P-VOL and S-VOL have the same data. If the P-VOL is updated after the initial copy operation,
the update copy operation takes place and synchronizes the P-VOL and S-VOL.
4. The following are the types of pair status (PSUS and PSUE) when the pair is not synchronized:
• When you split a pair (pairsplit), the pair status changes to COPY(SP) or PSUS(SP) for quick
pairsplit. During the pairsplit process, the pair status becomes COPY(SP). If you specify Quick Split
pairsplit, the pair status becomes PSUS(SP) during the process. When the pairsplit operation is