HP StorageWorks XP Remote Web Console Software - Manual (Page 176)

are suspending the group at the remote site, issue the suspend/group command to one R-VOL
in the RCU.
The copy pending timeout setting for the group determines the maximum amount of time that
the suspend/drain operation can take.
When the status for all TrueCopy for Mainframe Asynchronous pairs in the group has changed
to suspended, the duplicate set of volumes is complete. If desired, you can restart the application
at the main site.
176 TrueCopy for Mainframe Usage Scenarios