Hitachi MP-96RD625-01 manual Primary siteTCz Sync Primary site TCz Sync

	TCz Synchronous				TCz Synchronous
	secondary site				secondary site
	Tasks				Tasks
primary siteTCz Sync.			primary site TCz Sync.
	R-VOL	Master			M-VOL	Master
	Prim.
		JNL VOL
	VOL				JNL VOL
M-VOL	URz		R-VOL		URz
			Prim. data VOL
	secondary site				secondary site	UR
Master JNL				Master JNL
	VOL			VOL
	UR	Sec. data			Sec. data
	Restore	VOL				VOL
					Restore JNL VOL
	JNL VOL

Black arrow indicates copy direction. If an arrow is solid, the pair is in Duplex status. If an arrow is dotted, the pair is in Hold status.

M-VOL: main volume

R-VOL: remote volume

Prm data VOL: primary data volume

Sec. data VOL: secondary data volume

JNLVOL: journal volume

TCz Synchronous secondary site

primary site TCz Sync.

Tasks

		R-VOL
		Master
		JNL VOL
M-VOL	URz
Prim. data VOL
	secondary site
Master JNL
VOL
	UR	Sec. data
		VOL
		Restore JNL VOL

Figure 3-28 Transferring Business Tasks from the TCz Secondary Site to the Primary Site (When Delta Resync Operation is Performed in 3DC Multi-target Configuration)

Recovering from Failures in the Primary Site and the TCz Synchronous

Secondary Site

If a disaster or failure occurs in both the primary site and the TCz Synchronous secondary site in a 3DC multi-target configuration, you can resume your business tasks by using the secondary volume in the URz secondary site. After you transfer business tasks to the URz secondary site, you need to remove failures from the primary site and the TCz Synchronous secondary site, so that you will be able to transfer business tasks back to the primary site.

Chapter 3 Preparing for Universal Replicator z/OS Operations 3-51

Hitachi Universal Replicator for IBM /OS User’s Guide