Changing Storage Management Subsystem parameters

You can use the SET SMS or SETSMS MVS command to change SMS parameters. Use the SET SMS command to initialize SMS parameters from PARMLIB member IGDSMSxx and start SMS (or restart SMS if it was already active). Use the SETSMS command when SMS is active (running) to change a subset of SMS parameters by entering them from the console without changing IGDSMSxx.

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

Exception: To reactivate a null configuration, you must perform an IPL.

Restriction: Some of the parameters contained in the IGDSMSxx parmlib member cannot be changed using the SETSMS operator command. The section Parameters of the SETSMS operator command lists only those parameters that can be changed using the SETSMS operator command. For additional information, see z/OS MVS Initialization and Tuning Guide