HP StorageWorks XP Remote Web Console Software - Manual (Page 21)

Legend
: Time flow
: Data
Host
COPY(RS)
P-VOL S-VOL
PAIR
Host
Resynchronized
Write Data
Access permitted Access inhibited
Access permitted Access inhibited
P-VOL S-VOL
Figure 6 Forward Pairresync Operations
Caution: Even if the copy operation is completed without any host I/O, the data in the P-VOL and the
data in the S-VOL may not be the same. Whether the P-VOL and the S-VOL have the same data depends
on the condition of the storage system. To make the P-VOL data and the S-VOL data equal, split the
pair and make the pair status PSUS.
• Reverse Copy (backward pairresync in normal speed)
The reverse pairresync operation (see Figure 7 on page 23) synchronizes the P-VOL with the
S-VOL. The copy direction for a reverse pairresync operation is S-VOL to P-VOL. The pair status
XP24000 Business Copy Software User's Guide 21