HP XP P9000 for Business Continuity Manager Software User Guide (T5253-96081, July 2013)

Figure 24 A 4x4 configuration example
The 4x4x4 Cascade configuration
The 4x4x4 Cascade configuration is a combination of a 4x4 configuration and a 3DC Cascade
(Cnt Ac-S Z x Cnt Ac-J Z) configuration. This configuration is suitable for large-scale operations
because consistency can be preserved across multiple storage systems if the storage systems are
within the same extended consistency group (EXCTG).
Figure 25 (page 63) shows an example of a 4x4x4 Cascade configuration.
62 Business Continuity Manager with replication products