HP XP Business Copy Software - Manual (Page 22)

22 Business Copy XP (BC) for the XP128/XP1024
• Release the Cache LUN XP settings of the P-VOL and S-VOL before the quick restore operation, and
reset the Cache LUN XP settings of the P-VOL and S-VOL after the pair changes to PAIR status as a
result of the quick restore operation.
CAUTION: If you do not want the P-VOL and S-VOL to be resynchronized after the quick restore
operation, set the Swap&Freeze option before performing the quick restore operation (see
” Swap&Freeze option ” on page 24 and ” Setting BC options ” on page 58).
CAUTION: If a reverse or quick restore resync operation ends abnormally, or a Pairsplit-E (PSUE) is
requested during reverse or quick restore resync operation, the status of other BC pairs that share the same
P-VOL does not change.
NOTE: When a reverse or quick restore pairresync is in progress, you cannot perform paircreate,
pairsplit, or pairresync operations for any other pair that shares the same P-VOL (pairsplit-S and pairsplit-E
are allowed).
Use the Pairresync window (see ” Resynchronizing BC pairs (Pairresync) ” on page 52) to resynchronize split
and suspended BC pairs. When the pairresync operation starts, the pair status changes to COPY(RS) or
COPY(RS-R). When the pairresync is complete, the pair status changes to PAIR. The disk array resumes BC
update copy operations after the pair status changes to PAIR. The P-VOL remains fully accessible during a
normal pairresync operation, but becomes inaccessible to all hosts during a reverse or quick restore
pairresync operation. This ensures that data on the P-VOL is identical to data on the S-VOL when the
reverse or quick restore pairresync operation completes.
Table 5 Requirements for reverse or quick restore pairresync operations
Parameter Requirements
Pair status. The specified pair must be in the PSUS state. If not, the reverse or quick restore
pairresync command will be rejected.
All other pairs sharing the same P-VOL as the specified pair must also be in the PSUS
or PSUE state. If not, the reverse or quick restore pairresync command will be rejected.
Pair type A quick restore pairresync command to a pair that consists of customized volumes
and normal volumes will be rejected.
Reverse or quick restore
pairresync command
issued to a shared
BC/Continuous Access XP
volume.
If the BC and Continuous Access XP pairs share the same volume, and the BC pair is
not suspended, the reverse and quick restore pairresync operations cannot be
performed (the command will be rejected).
During the reverse or quick restore pairresync operation, a Continuous Access XP pair
cannot be created. The Continuous Access XP paircreate command will be rejected
when the BC pair status is COPY(RS-R).
Effect on other pairs
sharing the P-VOL.
If the reverse or quick restore pairresync operation is performed on one BC pair in a
1-to-n BC configuration (n>1), the P-VOL and the other S-VOLs are no longer
synchronized. While this reverse or quick restore pairresync is in progress, you cannot
perform paircreate, pairsplit, or pairresync operations for any other pair sharing the
same P-VOL (pairsplit-S and pairsplit-E are allowed).
Reverse or quick restore
resync ends abnormally;
OR, Pairsplit-E (PSUE) is
requested during reverse
or quick restore resync.
1. The pair status changes to PSUE.
2. The P-VOL of the PSUE pair is read- and write-enabled for all hosts; however, data
on the P-VOL is not guaranteed. The S-VOL of the PSUE pair remains
write-disabled (read-only); however, data on the S-VOL is not guaranteed.
3. The status of other BC pairs sharing the same P-VOL does not change.