To define a minimal configuration, define a storage class and storage group, and create their respective ACS routines.

Recommendation: Defining a data class and a management class and creating their respective ACS routines are not required for a valid SCDS. However, because the default management class is so important, it should be included in your minimal configuration.

Related Reading: For detailed information on defining SMS classes and groups using ISMF, see z/OS DFSMSdfp Storage Administration.