HP StorageWorks XP Remote Web Console Software - Manual (Page 41)

will be restored quickly by the delta resync operation, you will not need to wait for a long time before you
can use the URz data volumes again.
Delta resync operation consists of the two processes; one is the process for the preparation before the
failure occurs, the other is the process for the recovery after the failure occurs.
• Processing for the preparation before the failure occurs (see the next section)
• Processing for the recovery after the failure occurs (see
“ Switching the Master Journal Group of URz ” on page 43)
Journal Obtain in TCz Synchronous Secondary Site
To perform delta resync operation when a failure occurs, you also need to obtain the journal data in the
TCz Synchronous secondary site of 3DC multi-target configuration. Specify the TCz Synchronous R-VOL
in TCz Synchronous secondary site as the primary data volume, and specify the data volume in URz
secondary site as the secondary data volume, in order to create a URz pair for the delta resync operation.
When you create a URz pair for delta resync operation, the differential data of data volumes in TCz
Synchronous primary site and secondary site will be stored in the journal volumes in TCz Synchronous
secondary site as journal data. The following figure shows an example.
Hitachi Universal Replicator for z/OS user guide for XP12000/XP10000 Disk Arrays and SVS 200 41