At IPL, the system uses the MPFLSTxx member or members indicated on the MPF keyword on the INIT statement in CONSOLxx. You can specify multiple MPFLSTxx members on the MPF keyword. In a sysplex, MPF processing has system scope; thus, you must plan MPF processing on each system in the sysplex.

Using multiple members allows your installation to define separate MPF members to handle specific message processing functions for messages. For example, you might specify two members of MPFLSTxx to handle different automation procedures. Or you might have one MPFLSTxx member handle messages for suppression and another to handle messages for automation for a system. (Note that the system default allows the system to consider all messages as eligible for automation.) Operators can use the SET MPF command to activate these members as needed (for example, during shift changes or for workload balancing).