You can manually activate a new SMS configuration in two ways. SMS must be active before you use one of these methods. To start SMS, IPL the system with SMS defined as a valid subsystem, and start SMS automatically at IPL. Or, IPL the system with SMS defined as a valid subsystem, and start SMS later using the SET SMS=yy operator command.

Related Reading: For more information about activating a new SMS configuration, see z/OS DFSMSdfp Storage Administration.