Hitachi MP-96RD625-01 manual URz Pair, Operation Primary Data

3.Use Business Continuity Manager to execute the YKRESYNC REVERSE command on the TCz Synchronous pair.

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

4.In the either cases when the primary/secondary relationship of the TCz Synchronous pair is not reversed (i.e., the copy direction is not reversed as illustrated in the upper-right picture in Figure 10-3), or when the primary/secondary relationship of the TCz Synchronous pair is reversed (i.e., the copy direction is reversed as illustrated in the lower-right picture in Figure 10-3), use Business Continuity Manager’s YKRESYNC DELTAJNL command to 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 10-1 Changes of URz Pair Status by Delta Resync Operation (When Recovering from Failures in 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	Data Volume		Volume
URz pair between TCz	Duplex or	Duplex or	Hold	Hold
Synchronous primary site	Suspend	Suspend
and URz secondary site
URz pair between TCz	Hold	Hold	Duplex or Pending	Duplex or Pending
Synchronous secondary			Duplex	Duplex
site and URz secondary
site

Note: In order to transfer business tasks back to the primary site, please remove failures in the primary site and other locations, and then follow the instructions in section Transferring Business Tasks from TCz Secondary Site to the Primary Site (When Delta Resync Operation is Performed in 3DC multi-target configuration).

10-12 Chapter 10 Usage Scenarios

Hitachi Universal Replicator for IBM /OS User’s Guide