Implementing Security for DFSMS › DFP 3.0 and DFSMS › Storage Management Classes

Storage Management Classes

SMS recognizes the storage management data set classes:

Data

Defines attributes about the data set that would normally be associated with the DCB or the AMP parameters in the JCL. Data class definitions take the place of model DSCBs, but also include information for VSAM data sets as well. Even if a data set is not SMS controlled, a Data class can be associated with it.

Management

Defines space and availability management attributes of the data set. This includes how often to back it up and how many backup versions should be kept. This class can only be associated with an SMS controlled data set.

The definitions of all of the classes are kept in a control data set and each of them is known by a unique eight‑character name. It is through this name that access to data set classes is secured through external security calls. SMS controlled data sets carry the name of the Data, Storage, and Management classes associated with them in their ICF catalog and VVDS records.