HP XP P9500 Storage - Manual (Page 247)

4. From the remote host, register a command device for each of the storage systems at the remote,
intermediate, and primary sites.
Creating a Copy Group
Using the copy group in the following figure as an example, the following describes how to define
a copy group, create a copy pair, and register the copy pair in the EXCTG of the storage system.
Figure 93 4x4x4 Cascade Copy Group
Perform the following procedure from the primary host.
Defining a 4x4x4 Cascade Configuration 247