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Chapter 3 Preparing for Universal Replicator z/OS Operations 3-41
Hitachi Universal Replicator for IBM /OS User’s Guide
For detailed information about the hardware configuration required for 3DC
multi-target configuration, see the next section. For detailed information about
the requirements to create a URz pair for delta resync operation, see section
Requirements for Creating URz Pair for Delta Resync Operation. As for the
requirements to perform delta resync operation, see section
Requirements for
Performing Delta Resync Operation.
If a failure occurs in a TCz Synchronous primary volume, which is also used as
a URz primary data volume, you can resume business tasks by using the TCz
Synchronous secondary volume. After you resume business tasks, you need to
remove the failure from the primary volume and transfer business tasks back
to the primary site. For details, see sections
Recovering from Failures in the
Primary Site and the TCz Synchronous Secondary Site through
Transferring
Business Tasks from the URz Secondary Site to the Primary Site.
If a failure occurs in both the primary volume and the TCz Synchronous
secondary volume, you can resume your business tasks by using the URz
secondary data volume. After you resume business tasks, you need to remove
the failure from the primary volume and the TCz Synchronous secondary
volume, and transfer business tasks back to the primary site.
Hardware Configuration
A computer system in 3DC multi-target configuration requires the following
three sites:
• Primary site for both TCz Synchronous and URz
• Secondary site for TCz Synchronous
• Secondary site for URz
Each of these sites requires one USP V storage system and Storage Navigator
computers. It is recommended that Business Continuity Manager should be
installed in host computers in each of these sites.
The following explains hardware configuration for USP V storage systems in
these sites.
USP V storage system in the primary site:
– The USP V storage system must have TCz Synchronous installed.
– The USP V storage system must have URz installed.
– The USP V storage system must have a volume used as a TCz
Synchronous primary volume and a URz primary data volume.
– The USP V storage system must have a URz master journal volume
– If you use Business Continuity Manager, you need to make settings on
the storage system. Please refer to the Business Continuity Manager
User's Guide for information about settings required for volume
operations in remote sites.