DFSMS/VM Functional Components Overview

There are four major functional components of DFSMS/VM FL 221:

1. User interface consists of:
   • Interactive Storage Management Facility (ISMF), which offers a set of menus, data entry panels, and list panels that run on the user's virtual machine. Through ISMF, you can select applications to:
     • Perform storage management functions against the file and minidisk lists
     • Create file, minidisk, and management class lists based on your criteria
     • Define management classes
     • Edit and test automatic class selection (ACS) routines
     • Define the installation's space management policies in DFSMS configurations
     • Activate DFSMS/VM FL 221 configurations.
   • DFSMS module, which provides a command interface to most minidisk and storage management functions
   • DFSMSRM module, which provides a command interface to removable media services functions
   • A set of CSL-routine programming interfaces to removable media services functions.
2. Minidisk management provides:
   • A high-performance data mover for copying CMS-formatted minidisks between like and unlike DASD
   • The capability to do an integrity-evaluation of CMS minidisks
   • The capability to perform the move and integrity-evaluation operations against a list of minidisks.
3. Space management provides:
   • Automatic assignment of management classes to SFS files and directories
   • Automatic migration (with compaction) or erasure of selected SFS files based on management class policies
   • Migration to ML1 and ML2 (lower cost tape and/or dasd)
   • Automatic recall of migrated files upon reference
   • Command-initiated migration and recall of files.
4. Removable media services (RMS) provides:
   • Support of the IBM 3495 Tape Library Dataserver to extend automated mount support and other library capabilities to VM users and tape management applications.