–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
–In
–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.
Chapter 3 Preparing for Universal Replicator z/OS Operations |
