HP P9000 Business Continuity Manager User Guide

3DC Cascade Configuration
This configuration performs remote copying from the primary site to a nearby intermediate site and
a distant remote site. Continuous Access Synchronous for Mainframe is used from the primary site
to the intermediate site, and Continuous Access Journal for Mainframe from the intermediate site
to the secondary site.
3DC Multi-Target Configuration
This configuration performs remote copying from the primary site to the local site with Continuous
Access Synchronous for Mainframe, and from the primary site to the remote site with Continuous
Access Journal for Mainframe.
3DC Multi-Target Configuration with the Delta Resync Function
This configuration allows operation at the local site and remote site under a 2DC configuration to
start immediately during a primary site failure or maintenance. In a 3DC Multi-Target configuration,
a Continuous Access Journal for Mainframe copy pair (called a delta resync pair) must be created
between the Continuous Access Synchronous for Mainframe S-VOL on the local site and the
Continuous Access Journal for Mainframe S-VOL on the remote site beforehand, and is put in the
delta resync waiting status (meaning that the pair is in the suspend status while the journal for the
delta resync pair acquires the differential data between the S-VOLs on the local and remote sites).
For details about the Delta Resync Function, see “The Delta Resync configuration” (page 47).
28 Overview of HP P9000 for Business Continuity Manager Software