HP StorageWorks XP Remote Web Console Software - Manual (Page 18)

Figure 7 Backward Pairresync Operations
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The P-VOL remains read-enabled during the quick restore operation only to enable the volume
to be recognized by the host. The data on the P-VOL is not guaranteed until the quick restore
operation is complete and the status changes to PAIR.
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During reverse or quick restore pairresync, you cannot perform paircreate, pairsplit, or
pairresync for any other pair that shares the same P-VOL (pairsplit-S and pairsplit-E are allowed).
Pairresync operation time depends on the pair status, PSUS or PSUE. The relationship between the
pair status and the time required for pairresync operations are as follows:
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Pairresync for PSUS pair
When a normal/quick pairresync operation is performed on a split pair (status = PSUS), the
storage system copies all differential tracks from the P-VOL to the S-VOL. When a reverse or
quick restore pairresync operation is performed on a split pair, the storage system copies all
differential tracks from the S-VOL to the P-VOL. This ensures that the P-VOL and S-VOL are
18 About XP Business Copy Operations