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2. Because Cache LUN settings are exchanged during a quick restore operation, you must perform one
of the following operations. If you do not, the change of location of cache residence areas may
causeI/OperformancetotheCacheLUNdatatobedown.
• Set the same Cache LUN settings (locations) for the P-VOL and S-VOL before performing
thequickrestoreoperation.
• Release the Cache LUN settings of the P-VOL and S-VOL before the quick restore operation,
and reset the Cache LUN settings of the P-VOL and S-VOL after the pair changes to PAIR
status as a result of the quick restore operation.
CAUTION:
If you do not want the P-VOL and S-VOL to be resynchronized after the quick restore operation, set the
Swap&Freeze option before performing the quick restore operation (see Swap&Freeze option).
Table 7 shows the requirements for reverse and quick restore pairresync operations. If you perform these
operations on pairs that do not fulfill the requirements, the reverse copy or quick restore command
is rejected.
Table 7 Requirements for reverse or quick restore pairresync operations
Parameter
Requirements
Pair status
The specified pair must be in the PSUS state. All other pairs sharing the same
P-VOL as the specified pair must also be in the PSUS or PSUE state.
Pair type
Whether you can execute a quick restore command for a pair consisting of
customized and normal volumes depends on the volume's emulation type.
Shared BC/Continuous
Access XP volume
If BC and Continuous Access XP pairs share the same volume, and the Continuous
Access XP pair is not suspended, you cannot perform reverse and quick restore
pairresync operations.
Shared BC/Continuous
Access XP Journal volume
If the BC and Continuous Access XP Journal pairs share the same volume, and
the Continuous Access XP Journal pair is not suspended, you cannot perform the
reverse and quick restore pairresync operations.
NOTE:
A Continuous Access XP Journal P-VOL means a Continuous Access XP Journal primary data volume. A
Continuous Access XP Journal S-VOL means a Continuous Access XP Journal secondary data volume.
CAUTION:
If a reverse or quick restore resync operation ends abnormally, or a Pairsplit-E (PSUE) is requested
during a reverse or quick restore resync operation, the status of other BC pairs sharing the same P-VOL
does not change.
NOTE:
When a reverse or quick restore pairresync operation is in progress, you cannot perform paircreate,
pairsplit, or pairresync operations for any other pairs sharing the same P-VOL (pairsplit-S and pairsplit-E
are allowed).
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Business Copy XP (BC) for the Array