HP XP P9000 RAID Manager Reference Guide (T1610-96061, January 2014)

only), the pair is resynchronized in the reverse direction (that is, secondary volume to primary
volume). The primary volume remains accessible during pairresync, except when the -restore option
is specified. The secondary volume becomes write-disabled when the pairresync command is
issued.
The pairresync command cannot be used for Auto LUN.
The pairresync command 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 Synchronous Async, or Continuous Access Journal).
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 (XP12000 Disk Array/XP10000 Disk Array, and later), 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/Continuous Access Synchronous Async/Continuous Access Journal
only: The swaps(p) option is used to swap volume from the SVOL(PVOL) to PVOL(SVOL) at
suspending state on the SVOL(PVOL) side, and resynchronize the NEW_SVOL based on the
NEW_PVOL. At the result of this operation, the volume attributes of own host (local host) become
the attributes for the NEW_PVOL(SVOL). 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.
If -c size option is omitted, use 3 (default value of the number of copy track (-c size)).
Executes at PAIR state as well as PSUS/PSUE state (not applicable to COPY and SMPL).
If the target volume is already the PVOL (SVOL), the pair operation is skipped.
Figure 10 Pair Resynchronization
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