SETSSI command

Use the SETSSI to add, activate, deactivate, or delete a subsystem dynamically. You can issue the SETSSI command from one of the following:
  • A console that has master authority
  • A console to which an operator with sufficient RACF® authority has logged on.

Each subsystem determines whether it can process the SETSSI command by issuing the options request of the IEFSSI macro. See z/OS MVS Programming: Authorized Assembler Services Reference EDT-IXG for more information about the IEFSSI macro.

If you issue a SETSSI ACTIVATE or DEACTIVATE command for a subsystem that does not allow SETSSI commands, the system ignores the command and issues an error message to the console.

You can use the SETSSI ADD command to define dynamically any subsystem except the primary subsystem.

Attention: Once a subsystem name is defined to the system, any attempt to start that subsystem (or any started task with the same name as that subsystem) via a START command which does not explicitly specify SUB=JES2 (or JES3) will result in that subsystem or started task being started under the Master subsystem rather than under the Job Entry subsystem. Then, because the only procedure libraries available to the Master subsystem are those specified in the MSTJCLxx's IEFPDSI data set, any procedures being started that are defined in the Job Entry subsystem's PROC00 data set but not in the MSTJCLxx's IEFPDSI data set will be unavailable and will therefore not be found; the system will issue message IEFC612I.