Avoid directing all update activity to a small set of common volumes on a single recovery site storage control. The performance impact at the recovery site storage control adversely affects the primary site performance.
Typically, only a few devices on a particular storage control receive most of the activity. Usually two to four devices account for 50% or more of the total update activity. If, for example, two primary storage controls channel their most active volumes into a single recovery site storage control, the recovery subsystem could become overcommitted with remote copy activity.
Table 1 provides a useful summary of PPRC session configurations.
| You can configure up to . . . | ||
|---|---|---|
 16 PPRC recovery site storage
subsystems |
for each | PPRC primary site storage subsystem |
| 8 PPRC paths | between | primary and secondary LSSes |