Each primary host system write I/O operation passes through the PPRC connection to the recovery site storage control, and then to the recovery system disk devices. RMF statistics do not currently report PPRC connection activity.
RMF reports list reasons for I/O operation delays, including storage control, and ESCON® Director port-busy states. Even though PPRC activity may be responsible for these busy conditions, RMF does not explicitly track PPRC activity. PPRC activity may delay primary system I/O operations. You should consider this when you do your capacity planning as well as RMF data interpretation.