Hitachi ShadowImage for Mainframe User Guide: HP XP24000 Disk Array, HP XP20000 Disk Array (T5213-96032, May 2011)

Figure 6 Forward Pairresync Operations
CAUTION: Even if the copy operation is completed without any host I/O, the data in the S-VOL
and the data in the T-VOL may not be the same. Whether the S-VOL and the T-VOL have the same
data depends on the condition of the storage system. To make the S-VOL data and the T-VOL data
equal, split the pair and make the pair status split.
• Reverse Copy (backward pairresync in normal speed)
The reverse copy operation (see Figure 7 (page 19)) synchronizes the S-VOL with the T-VOL.
The copy direction for a reverse copy operation is T-VOL to S-VOL. The pair status during a
ShadowImage for Mainframe Operations 17