HP XP Business Copy Software - Manual (Page 26)

the requirements, the reverse copy or quick restore command is rejected. The pair status during
a reverse resync operation is COPY(RS-R), and the P-VOL and S-VOL become inaccessible to all
hosts for write operations during a reverse pairresync operation. When the reverse pairresync is
complete, the P-VOL becomes accessible. The reverse pairresync operation can only be performed
on split pairs (PSUS status), not on suspended pairs (PSUE status). The reverse pairresync operation
cannot be performed on L2 cascade pairs.
NOTE:
The P-VOL remains read-enabled during the reverse pairresync operation only to enable the host
to recognize the volume. Data on the P-VOL is not guaranteed until the reverse pairresync operation
is complete and the status changes to PAIR.
• Quick Restore. This operation ( Figure 5 ) speeds up reverse resync by changing the volume map
in the disk array to swap the contents of the P-VOL and S-VOL without copying the S-VOL data to
the P-VOL. The P-VOL and S-VOL are resynchronized when update copy operations are performed
for pairs in PAIR status. The pair status during a quick restore operation is COPY(RS-R) until the
volume map change is complete. The P-VOL and S-VOL become inaccessible to all hosts for write
operations during a quick restore operation. Quick restore cannot be performed on L2 cascade
pairs or on suspended pairs (PSUE status).
Table 6 shows the requirements for reverse and quick
restore pairresync operations. If you perform these operations on pairs that do not meet the re-
quirements, the reverse copy or quick restore command is rejected.
Figure 5 Reverse and quick restore pair operations
.
Business Copy XP (BC) for the Array 26