HP XP P9000 Business Continuity Manager User Guide (T5253-96086, November 2013)

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The Delta Resync standby status must be defined between the local site and remote site.
The 3DC Cascade (Cnt Ac-S Z x Cnt Ac-J Z) configuration
A 3DC Cascade (Cnt Ac-S Z x Cnt Ac-J Z) configuration performs Continuous Access Synchronous
Z and Continuous Access Journal Z 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 at 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.
Figure 13 (page 55) shows an example of the 3DC Cascade (Cnt Ac-S Z x Cnt Ac-J Z) configuration.
Figure 13 A 3DC Cascade (Cnt Ac-S Z x Cnt Ac-J Z) 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.
3DC Cascade (Cnt Ac-J Z x Cnt Ac-J Z) configuration
A 3DC Cascade (Cnt Ac-J Z x Cnt Ac-J Z) configuration consists of three Continuous Access Journal
Z sites, in which Continuous Access Journal Z is used to perform a remote copy from the primary
site to the intermediate site, and from the intermediate site to the remote site.
Figure 14 (page 56) shows an example of the 3DC Cascade (Cnt Ac-J Z x Cnt Ac-J Z) configuration.
Replication products and data center configurations 55