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File No. S360-36
Order No. GC28-6720-5 OS




Systems Reference Library




IBM System/360 Operating System:
MVT Guide
OS Release 21.7


This publication describes the MVT (multiprogramming with a
variable number of tasks) configuration of the operating system
control program. It contains a description of the MVT control
program, options available with MVT, information on optimizing
performance, information on modifying the system, and a
description of the internal logic of the MVT configuration.
General descriptions are provided of the operating environment
of the control program, of the initial program loading procedure,
and of the job management, task management, data
management, volume management and recovery management
functions.

The MVT configuration of the control program is designed for
use with System/360 Models 40, 50, 65, 75, 85, 91, 95, and
195; with the System/360 Model 65 Multiprocessing System;
and with System/370 Models 145, 155, 165, and 195. The
minimum main storage is 262,144 (256K) bytes, or 524,288
(512K) bytes in the case of the Model 65 Multiprocessing
system.
Sixth Edition (August, 1974)
This is a reprint of GC28-6720-4 incorporating changes released in the following Technical
Newsletter:
GN28-2553 (dated April 16, 1973)

This edition applies to release 21.7 oflBM System/360 Operating System. Information
in this publication is subject to change. Before using this publication, be sure you have
the latest edition and any Technical Newsletters.

Requests for copies of IBM publications should be made to your IBM representative or to
the IBM branch office serving your locality.

A form for readers' comments is provided at the back of this publication. If the form has
been removed, comments may be addressed to IBM Corporation, Publications Development,
Department D58, Building 706-2, PO Box 390, Poughkeepsie, N.Y. 12602. Comments
become the property of IBM.