HP StorageWorks XP Remote Web Console Software - Manual (Page 160)

Resynchronizing TrueCopy for Mainframe Pairs
While a TrueCopy for Mainframe pair is suspended, the MCU does not perform any update copy
operations.
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For a suspended TrueCopy for Mainframe Synchronous pair, the MCU may or may not continue
accepting write I/Os for the M-VOL depending on the M-VOL fence level and suspend kind
option (if user-requested). If the MCU accepts write I/Os for a suspended M-VOL, the MCU
records the data in the M-VOL tracks that are updated while the pair is suspended as a
differential data, and copies the out-of-sync tracks to the R-VOL when the pair is resynchronized.
If you use an earlier storage system model than HP disk array as RCU, the VOLSER is also
copied.
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For a suspended TrueCopy for Mainframe Asynchronous pair, the MCU and RCU keep track
of any recordsets that were discarded during suspension, and the MCU continues accepting
write I/Os for the M-VOL. When a TrueCopy for Mainframe Asynchronous pair is
resynchronized, the MCU merges the M-VOL and R-VOL differential data and then copies the
out-of-sync tracks to the R-VOL to resynchronize the pair. If you use an earlier storage system
model than an XP1024/XP128 Disk Array as RCU, the VOLSER is also copied.
The Resume Pair dialog box (see “Resume Pair Dialog Box (First: TrueCopy for Mainframe pair;
Second: TrueCopy for Mainframe Asynchronous pair)” (page 161) ) allows you to resynchronize
suspended TrueCopy for Mainframe pairs. To open the Resume Pair dialog box, click Pair Operation
tab, select a CU grouping or CU from the tree, select the M-VOL(s) of the pair(s) to be
resynchronized, right-click, and then click Resume Pair.
160 Performing TrueCopy for Mainframe Pair Operations