HP XP Racks - Manual (Page 40)

4x4x4 Cascade configuration
This configuration is a combination of a 4x4 configuration and a 3DC Cascade (Cnt Ac-S Z x Cnt
Ac-J Z) configuration. Between the primary site and the intermediate site, a Continuous Access
Synchronous Z copy group is used. Between the intermediate site and the remote site, the Continuous
Access Journal Z copy group that defined an extended consistency group (EXCTG) is used. This
configuration can preserve consistency across multiple storage systems in an EXCTG.
40 Overview of HP XP7 for Business Continuity Manager