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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-V
OLisstillnotavailableforwriteoperationsuntilthereserveattributeisreset.
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 cop
yoperations.
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 8 BC options types and requirements
Option type
Features
Requirement
Swap&Freeze
Suppresses the update copy.
See Swap&Freeze option.
You must change disk array setting to
enable the quick restore operation.
Host I/O Performance
Suppresses the BC copy operations.
See Host I/O Performance option.
—
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 operation is
performed without the Swap&Freeze option, the P-VOL and S-VOL are resynchronized when update copy
operations are performed for pairs in PAIR status.
The following figure shows the state of the S-VOL after the quick restore operation with or without the
Swap&Freeze option.
Business Copy XP user guide
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