HP StorageWorks XP Remote Web Console Software - Manual (Page 88)

URz
MCU
Primary data
volume Master journal
volume
Business Continuity Manager
Restore journal volume
- Secondary data
volume
- SIz S-VOL
RCU
Execute split
operation at
10:00 Execute split
operation at 11:00
Execute split
operation at 12:00
SIz T-VOL SIz T-VOL
Back up copy at
10:00 Back up copy at
11:00 Back up copy at
12:00
SIz T-VOL
Figure 34 Overview of Split Operation
The At-Time Split function has the following restrictions when URz and ShadowImage for z/OS are
used in conjunction:
• The At-Time Split function can be executed by Business Continuity Manager, but cannot be
executed by XP Remote Web Console.
• You can execute split operations on SIz pairs that belong to ShadowImage for z/OS consistency
groups.
• You can apply one split operation to one ShadowImage for z/OS consistency group.
• You can apply up to three split operations to one journal group (equivalent to three ShadowImage
for z/OS consistency groups).
• One SIz S-VOL can be paired with up to three SIz T-VOLs. This enables you to create a maximum
of three generations of backup data.
The procedure to use the At-Time Split function when you combine URz with ShadowImage for z/OS is as
follows. The following steps enable you to make backup copy at a specified time without suspending
URz pairs.
1. Specify the split time by using Business Continuity Manager.
2. Among the URz restore journals, the journal data created before the split time is restored to
URz S-VOLs (SIz S-VOLs).
3. When URz detects the journal data from the restore journal which has the time stamp later than
the split time, restore operations will be suspended. After that, split operations will be executed
on SIz pairs which are in conjunction with URz S-VOL.
4. After SIz has completed the split operations, URz will resume the suspended restore operation
of the restore journal.
CAUTION:
If you use the At-Time Split function when combining URz with SIz, mind the following:
• Make sure that all of the URz S-VOLs are paired with SIz volumes. Also, all of the SIz pairs in
conjunction with URz S-VOLs must belong to the same ShadowImage for z/OS consistency
group. If all the URz S-VOLs are not paired with SIz volumes, or if SIz pairs in conjunction with
URz S-VOL belong to different ShadowImage for z/OS consistency groups, consistent backup
copy operations cannot be executed.
88 Preparing for Universal Replicator z/OS Operations