Hitachi MP-96RD625-01 manual Recovering from Failures in the Primary Site

		TCz Synchronous
	TCz	secondary site
		R-VOL
	Synchronous
Tasks		JNLVOL
M-VOL/Prm.
data VOL
Primary site	Master
	JNLVOL
	URz	Sec. data VOL
		Restore URz
		JNLVOL secondary site

Black arrow indicates copy direction. If an arrow is solid (not dotted), the pair is in Duplex status.

M-VOL: main volume

R-VOL: remote volume

Prm data VOL: primary data volume

Sec. data VOL: secondary data volume

JNLVOL: journal volume

	Tasks	TCz Synchronous
TCz	R-VOL/Prm.	secondary site
	data VOL
Synchronous
		Master
		JNLVOL
M-VOL		URz

Primary site JNLVOL

Sec. data VOL

			Restore	URz
			JNLVOL	secondary site
		Tasks	TCz Synchronous
	TCz		secondary site
		M-VOL
	Synchronous
			JNLVOL
R-VOL/Prm.
data VOL
Primary site	Master
	JNLVOL
	URz			Sec. data VOL
			Restore	URz
			JNLVOL	secondary site

Figure 10-2 Recovering from Failures in the Primary Site

Recovering from Failures in the Primary Site (When Delta Resync Operation is

Performed)

If a disaster or failure occurs only in the primary site in 3DC multi-target system, you can use secondary volume in the TCz Synchronous secondary site to enable the secondary site to take over your business tasks. After transferring your business tasks to the secondary site, you need to remove the failure from the primary site, so that you will be able to transfer your business tasks back to the primary site.

To transfer your business tasks to the TCz Synchronous secondary site, follow the procedure below. Business Continuity Manager is used in this procedure:

1.Use Business Continuity Manager to execute the YKSUSPND REVERSE command on the TCz Synchronous pair.

TCz Synchronous pair will be split and the copy operation stops temporarily.

2.Use the TCz Synchronous remote volume to resume your business tasks.

Chapter 10 Usage Scenarios 10-11

Hitachi Universal Replicator for IBM /OS User’s Guide