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10-12 Chapter 10 Usage Scenarios
Hitachi Universal Replicator for IBM /OS User’s Guide
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)
Pair Status before Delta Resync
Operation
Pair Status after Delta Resync Operation URz Pair
Primary Data
Volume
Secondary
Data Volume
Primary Data Volume Secondary Data
Volume
URz pair between TCz
Synchronous primary site
and URz secondary site
Duplex or
Suspend
Duplex or
Suspend
Hold Hold
URz pair between TCz
Synchronous secondary
site and URz secondary
site
Hold Hold
Duplex or Pending
Duplex
Duplex or Pending
Duplex
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).