HP StorageWorks XP Remote Web Console Software - Manual (Page 84)

Recovering from Failures in the Primary Site
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 this procedure, using
Business Continuity Manager:
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.
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 (that is, the copy direction is not reversed as illustrated in the upper-right picture
in
Figure 39 (page 85) ), or when the primary/secondary relationship of the TCz Synchronous
pair is reversed (that is, the copy direction is reversed as illustrated in the lower-right picture
in
Figure 39 (page 85) ), 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 22 Changes of URz Pair Status by Delta Resync Operation (When Recovering from
Failures in the Primary Site)
Pair Status after Delta Resync
Operation Pair Status before Delta Resync
Operation
URz Pair
Secondary Data
Volume
Primary Data
Volume
Secondary Data
Volume
Primary Data
Volume
Hold Hold Duplex or
Suspend Duplex or
Suspend URz pair between TCz
Synchronous primary
site and URz
secondary site
Duplex or
Pending Duplex Duplex or
Pending Duplex Hold Hold URz pair between TCz
Synchronous
secondary site and
URz secondary site
84 Requirements and Restrictions for Universal Replicator z/OS Operations