ABCs of z/OS System Programming Volume 3 - IBM Redbooks

4.76 Managing libraries and storage locations
RMM CDS
Figure 4-87 DFSMSrmm: managing libraries and storage locations
Managing libraries and storage locations
DFSMSrmm records the complete inventory of the removable media library and storage
locations in the DFSMSrmm control data set, which is a VSAM key-sequenced data set. In
the control data set, DFSMSrmm records all changes made to the inventory (such as adding
or deleting volumes), and also keeps track of all movement between libraries and storage
locations. DFSMSrmm manages the movement of volumes among all library types and
storage locations. This lets you control where a volume—and hence, a data set—resides, and
how long it is retained.
DFSMSrmm helps you manage the movement of your volumes and retention of your data
over their full life, from initial use to the time they are retired from service. Among the
functions DFSMSrmm performs for you are:
► Automatically initializing and erasing volumes
► Recording information about volumes and data sets as they are used
► Expiration processing
► Identifying volumes with high error levels that require replacement
To make full use of all of the DFSMSrmm functions, you specify installation setup options and
define retention and movement policies. DFSMSrmm provides you with utilities to implement
the policies you define. Since z/OS 1.7, we have DFSMSrmm enterprise enablement that
allows high-level languages to issue DFSMSrmm commands through Web services.
IBM 3494
Virtual Tape Server
Chapter 4. Storage management software 237