HP StorageWorks XP Remote Web Console Software - Manual (Page 72)

Using At-Time Split Function When Combining URz with ShadowImage for z/OS
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.
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.
If you use the At-Time Split function when combining URz with SIz, take into account the following
considerations:
72 Requirements and Restrictions for Universal Replicator z/OS Operations