HP StorageWorks XP Remote Web Console Software - Manual (Page 93)

could not change the URz pair status to Duplex and could not reverse the copy direction,
please use Business Continuity Manager to execute the YKRESYNC REVERSE command onto the
journal groups that will make a URz pair between the intermediate site and the secondary
site. YKRESYNC is a command for re-establishing a pair.
3. Wait until the status of the URz pair changes to Duplex.
4. Use Business Continuity Manager to execute the YKSUSPND REVERSE command onto the
journal groups that will make a URz pair between the intermediate site and the secondary site.
YKSUSPND is a command for splitting a pair and stopping the copy operation temporarily.
5. Wait until the status of the URz pair changes to Suspend.
6. If the TCz Synchronous volume is not in Simplex status, use Business Continuity Manager to
execute the YKDELETE command onto the TCz Synchronous pair, and then wait until the status
changes to Simplex. YKDELETE is a command for releasing a pair.
If the TCz Synchronous volume is in Simplex status, use Business Continuity Manager to execute the
YKMAKE REVERSE command onto the TCz Synchronous pair that exists between the primary site and
the intermediate site. YKMAKE is a command for establishing a pair.
7. Use Business Continuity Manager to execute the YKSUSPND FORWARD command onto the TCz
Synchronous pair that exists between the primary site and the intermediate site.
8. Use Business Continuity Manager to execute the YKDELETE command onto the TCz Synchronous
pair that exists between the primary site and the intermediate site.
9. Use volumes in the primary site to resume your business tasks.
10. Execute the YKDELETE command onto journal groups that will make a URz pair between the
intermediate site and the secondary site.
The system returns to the status before the 3DC cascading configuration was set up.
For detailed information about Business Continuity Manager usage and copy statuses, please refer
to Business Continuity Manager User’s Guide.
Combining URz with TCz Synchronous (3DC Multi-target Configuration)
The XP storage system provides the function to combine URz and TCz Synchronous. In a system where
URz and TCz Synchronous are combined, there are one primary site and two secondary sites. One of
the secondary sites is for synchronous remote copy, and is usually located at a short distance from
the primary site. The other secondary site is for asynchronous remote copy, and is usually located at
a long distance from the primary site. Such a system configuration is called three data center (3DC)
multi-target configuration.
3DC multi-target configuration provides solution for disaster recovery and business continuity. Even when
a disaster or failure occurs at two sites at the same time, you can restart your business tasks by using
data in the remaining secondary site.
The figure below illustrates a 3DC multi-target configuration where URz and TCz Synchronous are
combined. In this configuration, there are three sites as follows:
• Primary site for both TCz Synchronous and URz
• Secondary site for TCz Synchronous
• Secondary site for URz
Hitachi Universal Replicator for z/OS user guide for XP12000/XP10000 Disk Arrays and SVS 200 93