HP XP P9500 Storage - Manual (Page 495)

3. Start primary site storage system maintenance.
4. Start operation at the intermediate site.
Change the configuration to a 4x4 configuration in which operation is performed from the
intermediate site.
Failback
1. Terminate primary site storage system maintenance.
2. Stop operation at the intermediate site.
3. From the primary site, execute the YKRESYNC REVERSE command for the Continuous Access
Synchronous Z copy group container.
Using a 4x4x4 Cascade Configuration 495