Hitachi MP-96RD625-01 manual Overview of Split Operation

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.

Business Continuity Manager

Primary data volume

	URz
Master journal	- Secondary data			Restore journal volume
volume
	volume
	- SIz S-VOL
	Execute split			Execute split
		Execute	split	operation at 12:00
	operation at	operation	at 11:00
	10:00

MCU

SIz T-VOL	SIz T-VOL	SIz T-VOL
Back up copy at	Back up copy at	Back up copy at
10:00	11:00	12:00
	RCU

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.

3-32 Chapter 3 Preparing for Universal Replicator z/OS Operations

Hitachi Universal Replicator for IBM /OS User’s Guide