HP StorageWorks XP Remote Web Console Software - Manual (Page 137)

Resynchronizing XP Continuous Access Pairs
While an XP Continuous Access pair is split or suspended, the MCU does not perform any update
copy operations to the S-VOL.
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For a split/suspended XP Continuous Access Synchronous pair, the MCU may or may not
continue accepting write I/Os for the P-VOL depending on the P-VOL fence level pair option
and suspend kind pairsplit option (if user-requested) .
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For a split/suspended XP Continuous Access Asynchronous pair, the MCU and RCU keep
track of any recordsets that were discarded during a pairsplit/suspension, and the MCU
continues to accept write I/Os for the P-VOL. The MCU records the data in the P-VOL tracks
that are updated while the pair is split/suspended as differential data.
If the RCU accepts write I/Os for a split S-VOL (S-VOL write enable pairsplit option), the RCU
records the data in the S-VOL tracks that are updated as differential data. When the split/suspended
pair is resynchronized, the MCU compares the differential data of P-VOL and S-VOL to determine
the out-of-sync tracks.
The Pairresync dialog box (see Figure 53 (page 138) ) allows you to resynchronize split and
suspended XP Continuous Access pairs and select the pairresync options. To open the Pairresync
dialog box, click the Pair Operation tab, select a CU grouping, CU, port, or host group from the
tree, select the desired pair, right-click, and then click Pairresync command.
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