HP XP Business Copy Software - Manual (Page 31)

changes the status of the P-VOL and S-VOL to SMPL, accepts all subsequent write I/Os to the S-
VOL, and does not keep track of updates.
• When the disk array detects an error condition related to an update copy operation.
• When the P-VOL and/or S-VOL track map in shared memory is lost (for example, due to offline
microprogram exchange). This applies to COPY(SP) and PSUS(SP) pairs only. For PAIR, PSUS,
COPY(RS), or COPY(RS-R) pairs, the pair is not suspended, but the entire P-VOL (S-VOL for reverse
or quick restore pairresync) is marked as difference data.
Use the Pairsplit-E window to suspend BC pairs. When a pair is suspended, the status changes to
PSUE. When the pairresync operation starts, the pair status changes to COPY(RS). The P-VOL remains
fully accessible while suspended and during the pairresync operation.
Pairsplit-S operation (delete)
This operation stops BC copy operations to the S-VOL of the pair and changes the pair status of both
volumes to SMPL. The volumes are not deleted. A BC pair can be deleted at any time except during
the quick pairsplit operation (or any status except SMPL status and PSUS(SP) status). After you delete
a BC pair, the S-VOL is still not available for write operations until the reserve attribute is reset.
Use the Pairsplit-S window to delete BC pairs. When a BC pair is deleted, pending update copy
operations for the pair are discarded, and the status of the P-VOL and S-VOL is changed to SMPL.
CAUTION:
The S-VOL of a duplex pair (PAIR status) may not be identical to its P-VOL due to the asynchronous
BC update copy operations.
BC options
Use the BC options to extend standard BC operations such as the paircreate and pairresync operations.
The following table lists the options that are currently available.
Table 7 BC options types and requirements
Requirement Features Option type
You must change disk array setting
to enable the quick restore opera-
tion. Suppresses the update copy.
See
Swap&Freeze option .
Swap&Freeze
—
Suppresses the BC copy operations.
See
Host I/O Performance option .
Host I/O Performance
NOTE:
The number of available option types depends on the disk array's settings.
Swap&Freeze option
This option allows the S-VOLs of a BC pair to remain unchanged after the quick restore operation. If
the quick restore operation is performed on a BC pair with the Swap&Freeze option, update copy
operations are suppressed for pairs in PAIR status after the quick restore operation. If the quick restore
XP Business Copy User Guide 31