HP StorageWorks XP Remote Web Console Software - Manual (Page 100)

3-34 Chapter 3 Preparing for Universal Replicator z/OS Operations
Hitachi Universal Replicator for IBM /OS User’s Guide
– The specified split time is enabled even after the split operation has
been executed on SIz pair. When you execute split operation again on
ShadowImage for z/OS® consistency group that has been split before,
specify the split time after deleting the split time registered before.
– In cascading configuration of URz and TrueCopy for z/OS®, the At-Time
Split function cannot be used for SIz pairs in conjunction with URz S-
VOLs.
– In Multi-target configuration of URz and TrueCopy for z/OS®, when the
At-Time Split function is used for SIz pairs in conjunction with URz S-
VOLs, please mind the following: when URz and TrueCopy for z/OS®
are configured in a cascading configuration during disaster recovery
operation, the At-Time Split function cannot be used.
– The specified split time will be reset by executing PS OFF of RCU.
– You cannot execute Reverse Resync of URz when split time is already
specified. Please execute Reverse Resync after you delete all the
specified split time of SIz pairs in conjunction with the restore journal
group. For details on Reverse Resync, please refer to the Business
Continuity Manager™ User's Guide.
– When split time is set to ShadowImage for z/OS ® consistency group,
you cannot perform Add Pair operation, Pair Resync operation, or Split
Pair operation from the Business Continuity Manager. If you need to
execute Add Pair operation, Pair Resync operation, or Split Pair
operation, please delete the split time in advance. When split time is set
to ShadowImage for z/OS ® consistency group, pairs can be deleted. If
you delete the following pairs, the specified split time will be deleted:
– Delete all the SIz pairs belonging to the ShadowImage for z/OS ®
consistency group.
– Delete all the URz pairs belonging to the URz restore journal group.
TCz Synchronous (3DC Cascading Configuration)
The USP V storage system provides the function to combine URz and TCz
Synchronous. This combination is intended to ensure that the response time
against host I/Os is comparable, regardless of whether the distance between
the primary and the secondary sites are short or long. This combination is also
intended to ensure that the secondary site stores data that has been stored in
the primary site even when a failure occurs in the primary site. These
intentions will be fulfilled if remote copy operations are performed using
cascading connections and a three data center (3DC) configuration; in a 3DC
configuration, an intermediate site is located between the primary and
secondary sites.