HP StorageWorks XP Remote Web Console Software - Manual (Page 105)

Chapter 3 Preparing for Universal Replicator z/OS Operations 3-39
Hitachi Universal Replicator for IBM /OS User’s Guide
2. 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.
Note: 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.
Note: YKMAKE is a command for establishing a pair.
1. 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.
2. Use Business Continuity Manager to execute the YKDELETE command onto
the TCz Synchronous pair that exists between the primary site and the
intermediate site.
3. Use volumes in the primary site to resume your business tasks.
4. 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.
TCz Synchronous (3DC Multi-target Configuration)
The USP V 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