A unique DB2 ECCR instance is required for each subsystem. The DB2 ECCR connects only to a single subsystem and captures changes only from that subsystem, assuming you do not use data sharing.

The capture name that you specify in the CA statement in the DB2 ECCR REPL2CTL control file must be unique for each ECCR and across the z/OS image and sysplex.

Each DB2 ECCR can have its own unique set of PowerExchange Listener, Agent, and Logger tasks, although configuring a separate environment for each ECCR is not required. For example, you might want to configure separate environments for test and production subsystems, but use the same environment for two test systems.