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File No. S360-36
Order No. GC28-6720-4
Systems Reference Library
IBM System/3S0 Operating System
MVT Guide
OS Release 21
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, volwlle management and recover, 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;
I 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.
Information in this publication for TSO with the Model 65
Multiprocessing (M65MP) configuration is for planning purposes
until that item is available.
IFifth Edition (March, 1972)
This is a major revision of, and obsoletes, GC28-6720-3. Section IV of this publication
contains a major quantity of the information formerly in IBM System/360 Operating
System: System Programmer's Guide, GC28-6550. The publication, IBM
System/360 Operating System: Data Management for System Programmers,
GC28-6550, contains the remaining System Programmer's Guide material. Changes to
text and illustrations are indicated by a vertical line to the left of the change. A
summary of major changes appears after the table of contents.
Isubsequent releases untiltootherwise21indicated in new editions or Technical Newsletters.
This edition applies Release of IBM System/360 Operating System, and to all
Changes are continually made to the information herein; before using this publication in
connection with the operation of IBM systems, refer to the latest IBM System/360 SRL
Newsletter, GN20-0360, for the editions that are applicable and current.
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, Programming
Systems P"ublications, Department D58, PO Box 390, Poughk,eepsie, N. Y. 12602