HP XP Racks - Manual (Page 252)

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 95 4x4x4 Cascade Copy Group
Perform the following procedure from the primary host.
252 Configuration definitions