HP 3PAR Operating System Software - Manual (Page 196)

5. The primary and backup systems are resynchronized periodically:
•
automatically: according to the schedule specified by the setrcopygroup command
•
manually: when you issue the syncrcopy command
Figure 37 Remote Copy in Asynchronous Periodic Mode
Advantages of Asynchronous Periodic Mode
If one area of a volume is written to multiple times between two resynchronizations, Remote Copy
only needs to send the last write to the backup system. Therefore, asynchronous periodic mode
Remote Copy transfers less data overall than synchronous mode Remote Copy.
Additional Information: “Synchronization Types and Limits” (page 197)
196 Volume Group Modes