HP StorageWorks P9000 Reference Manual page 33

Pairresync terminates before resynchronization of the secondary (or primary) volume is complete.
Use the pair event waiting (pairevtwait) or pairdisplay command to verify that the resync operation
completed successfully (status changes from COPY to PAIR). The execution log file also shows
completion of the resync operation. The status transition of the paired volume is judged by the
status of the primary volume. The fence level is not changed (only for Continuous Access
Synchronous, Continuous Access Asynchronous, or Cnt Ac-J).
If no data was written to the secondary volume while the pair was split, the differential data on
the primary volume is copied. If data was written to the secondary volume, the differential data
on the primary volume and secondary volume is copied. This process is reversed when the Business
Copy -restore option is specified.
Before issuing the pairresync command (normal or reverse direction), make sure that the secondary
volume is not mounted on any UNIX system. Before issuing a reverse pairresync command, make
sure that the primary volume is not mounted on any UNIX system.
Note on Quick Resync/Restore: If the "$HORCC_RSYN=QUICK" /"$HORCC_REST=QUICK"
environment variable is set (XP24000/XP20000 Disk Array or XP12000 Disk Array/XP10000
Disk Array), the "pairresync" operation is performed as Quick Resync regardless of the system
option mode 87/80 setting via SVP. The $HORCC_RSYN and $HORCC_REST environment
variables are ignored by XP1024/XP128 Disk Array.
Continuous Access Synchronous only: The swaps(p) option is used to swap volume from the
S-VOL(P-VOL) to P-VOL(S-VOL) at suspending state on the S-VOL(P-VOL) side, and resynchronize
the NEW_S-VOL based on the NEW_P-VOL. At the result of this operation, the volume attributes
of own host (local host) become the attributes for the NEW_P-VOL(S-VOL). The paircreate command
cannot execute copy rejection for an error condition which made the target volume is accompanied
by maintenance work.
The swaps(p) option:
Ignores the -l option.
Uses a default of three for number of copy tracks (-c size) when -c size option is omitted.
Executes at PAIR state as well as PSUS/PSUE state (not applicable to COPY and SMPL).
Because the target volume of the local host is already the P-VOL(S-VOL), skips this target
volume.
Figure 10 Pair resynchronization
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