You can use the SET SMS or SETSMS MVS™ command to change SMS parameters. Use the SET SMS command to change parameters before you bring up SMS. Use the SETSMS command when SMS is active (running) to change a subset of SMS parameters from the console without changing the active IGDSMSxx member of SYS1.PARMLIB.

For descriptions of SET SMS and SETSMS, see z/OS MVS System Commands.