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3-32 Chapter 3 Preparing for Universal Replicator z/OS Operations
Hitachi Universal Replicator for IBM /OS User’s Guide
Using At-Time Split Function When Combining URz with
ShadowImage for z/OS
®
(SIz)
When URz secondary data volume (S-VOL) is specified as S-VOL of SIz pair,
you can specify the time of backup copy operation for URz by using the At-
Time Split function of the Business Continuity Manager. This backup copy
operation is called the split operation. The time when split operation is
executed is called the split time.
Restore journal volume
- Secondary data
volume
- SIz S-VOL
RCU
MCU
Primary data
volume
Master journal
volume
Business Continuity Manager
URz
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 3-21 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 Storage Navigator.
• 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.