Hitachi MP-96RD625-01 manual Operation, Volume, Pair, Business Tasks Back to the Primary Site

The copy direction of the TCz Synchronous pair will be reversed.

2.Stop business tasks at the TCz Synchronous secondary site.

3.Use Business Continuity Manager to execute the YKSUSPND FORWARD command on the TCz Synchronous pair.

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

4.Use the main volume in the primary site to resume your business tasks.

5.Use Business Continuity Manager to execute the YKRESYNC FORWARD command on the TCz Synchronous pair.

The copy direction of the pair will be returned to its original direction.

6.Perform delta resync operation on the volume in the TCz Synchronous secondary site.

The status of the data volumes of URz pair changes as explained in the following table.

Table 3-14 Changes of URz Pair Status by Delta Resync Operation (When Business Tasks are Transferred from TCz Secondary Site to the Primary Site)

URz Pair	Pair Status before Delta Resync		Pair Status after Delta Resync Operation
	Operation
	Primary Data	Secondary	Primary Data Volume	Secondary Data Volume
	Volume	Data Volume
URz pair between TCz	Hold	Hold	Duplex or Pending	Duplex or Pending
Synchronous primary site			Duplex	Duplex
and URz secondary site
URz pair between TCz	Duplex or	Duplex or	Hold	Hold
Synchronous secondary	Suspend	Suspend
site and URz secondary
site

Caution on transferring business tasks back to the primary site when using delta resync:

After you remove failures from the primary site and other locations and then the system is changed to 3DC multi-target configuration, the status of a pair between the primary site and the URz secondary site may be abnormal. If the status of the pair remains abnormal, you will be unable to transfer your business tasks back to the primary site. To solve this problem, please see Table 3-15, check the pair status and then perform a problem-solving operation before transferring business tasks back to the primary site.

Table 3-15 Pair Status and Operation after Recovery of the Primary Site

No.	If the Status of	and the Status of	Please Perform the Following Operation before Transferring
	the Pair in the	the Pair in the URz	Business Tasks Back to the Primary Site
	Primary Site is	Secondary Site is

Chapter 3 Preparing for Universal Replicator z/OS Operations 3-49

Hitachi Universal Replicator for IBM /OS User’s Guide