HP StorageWorks XP Remote Web Console Software - Manual (Page 27)

NOTE: The URz pair needs to be in Hold status to form the delta resync operation when the
failure occurs. However, the URz pair status may be changed to Hlde for example when the cache
memory or shared memory error occurs in TCz Synchronous secondary site, or when no journal
cannot be obtained in TCz Synchronous secondary site because of the failure in the master journal
volume or occurrence of the pinned track. If the status of the URz pair for delta resync operation
changes to Hlde, follow the steps in
Restoring a Pair of Data Volumes and change the pair status
to Hold again.
Switching the Master Journal Group of URz
When a failure occurs on the primary site in Figure 6 (page 26) (3DC multi-target configuration),
the URz pair for delta resync operation can use the journal group in TCz Synchronous secondary
site as the master journal group. To switch the master journal group, first change TCz Synchronous
secondary site to the primary site by using Business Continuity Manager, then perform the delta
resync operation on the primary data volume of the URz pair in Hold status. The following figure
shows an example.
URz Delta Resync Operation 27