The 3DC Cascade configuration
A 3DC Cascade configuration performs Continuous Access Synchronous for Mainframe and
Continuous Access Journal for Mainframe operations from the primary site to the nearby intermediate
site, and from the intermediate site to the distant remote site. This enables the secondary host to
use no-data-loss data on the intermediate site during maintenance or in the event of a relatively
small-scale regional disaster. If a wider area disaster occurs, the secondary host can use data on
the distant remote site.
“A 3DC Cascade configuration example ” (page 44) shows an example of the 3DC Cascade
configuration.
Figure 12 A 3DC Cascade configuration example
NOTE: When the Primary site is operating normally, there is no need for the hosts at the
intermediate and remote sites to operate.
The 3DC Multi-Target configuration
The primary site in a 3DC Multi-Target configuration performs normal Continuous Access
Synchronous for Mainframe and Continuous Access Journal for Mainframe operations, as well as
remote copy operations to apply application data to a nearby local site and a distant remote site.
Figure 13 (page 45) shows an example of a 3DC Multi-Target configuration.
44 Business Continuity Manager with replication products
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