page of GC20-1821-3 As Updated April 1, 1981 by TNt GN25-0840 r-'------------------ IThe recommendations in the VM/370 under
land OS/VS areas of this publication are Igenerate operating systems that run more VM/370 area and in the DOS/VSI meant to help an installation I efficiently under VM/370. I I , VM/370 users made many of these recommendations, and Isuggestions have not been submitted to any formal IBM Iresult, potential users should evaluate the applicability of
Irecommendations to their installations before implementation. L, ____ _ (March 1979)
This edition (GC20-1821-3) together with Technical Newsletters dated August 1, 1979; GN25-0773, dated March 3, 1980; and GN25-0840, dated April 1, 1981; applies to f1£ 11 (R£Qg£!!.!l! of the IBM Virtual Machine Facility/370, and to all
subsequent releases unless otherwise indicated in new editions or
Technical Newsletters.
Technical changes and additions to text and illustrations are indicated
by a vertical bar to the left of the change.
Changes are periodically made to the information contained herein;
before using this publication in connection with the operation of IBM systems, consult the IBM system/370 Order No. GC20-0001, for the editions that are applicable and current.
It is possible that this material may contain reference to, or information about, IBM products (machines and programs), programming, or
services which are not announced in your country. Such references or
information must not be construed to mean that IBM intends to announce
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copies of IBoM publications should be made to your IBM representative or
to the IBM branch office serving your locality.
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© copyright Business Machines Corporation 1976, 1977, 1979, ,981 I theirl
As at
thel I

This publication is for system programmers
who run OS, DOS, DOS/VS, DOS/VSE, OS/VS1, OS/VS2 SVS, OS/VS2 MVS, and VM/370 under
the VM/370 control program. It is also for VM/370 system programmers who plan to use
these system/360 or System/370 operating
systems under the control of VM/370. Users of the control program (CP) should
refer to the Virtual Machine Order No. GC20-1820, and Faci1ity/37Q: Order No. GC20-1806. Users of the conversational monitor
system (CMS) should refer to the Facility/370: £MS Order No. GC20-1819. Users of
communications
refer to the Commun icat ions the remote
subsystem (RSCS) Virtual .Remote (RSCS) GC20-1816.
spooling
should Machine U Users of the interactive problem control
system (IPCS) should refer to the IBH Faci1illLllQ: £Q!li£Q1 (IPCS) User's Guide, Order No. GC20-1823. OR G AN I Z A T ION This publication contains these sections: • "Section 1. General Considerations"
provides both introductory and general
usage information. The introductory
information briefly describes the
features of VM/370 as.they apply both to
the virtual machine and to the operating
system that is running in it. The
general usage information discusses
those aspects of running systems under VM/370 that are common to
all systems. It also describes how to
use VM/370 functions more efficiently
when running operating systems under VM/370. • "Section 2. VM/370 in a Virtual Machine"
explains how to test and update a VM/370 system that is itself operating under VM/370. • "Section 3. DOS/VS in a Virtual Machine" provides operating specific
to running DOS, DOS/VS, and DOS/VSE in a
April 1, 1981
Preface
virtual machine. It contains system
planning considerations for generating
and using these systems under VM/370, rather than stand-alone. • "Section 4. OS/VS in a Virtual Machine" provides operating information specific
to running OS, OS/VS1, and OS/VS2 in a
virtual machine. It contains system
planning considerations for generating
and using these systems under VM/370, rather than stand-alone.
TER MINOLOGY In this publication,
terminology is used:
the following • 2305 refers to the IBM 2305 Fixed Head • • • • • storage, Models and 2. 3270 refers to a series of display
devices, namely, the IBM 3275, 3276,
3277, and 3278 Display Stations. A
specific device type is used only when a
distinction is required between device
types. 3330 refers to the IBM 3330 Disk Storage, Models 1, 2, and 11; the IBM 3333 Disk Storage and Control, Models 1
and 11; and the 3350 Direct Access Storage operating in 3330/3333 Model 1
or 3330/3333 Model 2 compatibility mode. 3340 refers to the IBM Disk Storage; Models A2, B1 and B2; and, the
3344 Direct Access storage, Model B2. 3350 refers to the IBM 3350 Direct
Access Storage, Models A2 and B2, in
native mode.
FB-512 refers to the IBM 3310 and 3370 Direct Access Storage Devices.
Any information about display terminal
usage also applies to the IBM 3138, 3148,
and 3158 Display Consoles when used in
display mode, unless otherwise noted.
Any information to the 3284 or 3286 printer also pertains to the
IBM 3287, 3288, and 3289 printers, unless
otherwise noted. Any information pertaining to the IBM 2741 terminal also applies to the IBM 3767
terminal, Model 1, operating as a 2741,
unless otherwise specified. Preface iii