Disk channel connections include those to primary and recovery systems. PPRC connections between storage subsystems can be ESCON® or FCP connections. The use of fibre channel allows a reduction in PPRC infrastructures by a 4 to 1 ratio while delivering equivalent or better performance.
Tip: It might be useful when planning an initial PPRC test installation (with a limited number of volumes) to have both the primary and secondary volumes on the same storage subsystem, thereby conserving resources.