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File No. S370-34
Order No. GC20-1821-3

IBM Virtual Machine
Facility /370:
Operating Systems in a
Systems Virtual Machine
Release 6 PLC 17

This publication is for system programmers who plan to use
System/360 or System/370 operating systems under the control
of VM/370. It is also for VM/370 system programmers
who plan to use these operating systems or VM/370 under the
control of VM/370. The publication describes those aspects
of running operating systems under VM/370 that are common
to all systems, and it describes how to use VM/370
functions more efficiently when running operating systems
under VM/370. The book also provides system planning and
operating considerations when running VM/370, DOS/VS, and
OS/VS under VM/370.

Many thoughts expressed in this publication are contributions
from VM/370 customers and IBM field personnel. As such,
these thoughts may not have been formally tested by 18M,
and therefore, may prove more usefui for some
installations than others.

PREREQUISITE PUBLICATION

IBM Virtual Machine Facility/370:
Introduction, Order No. GC20-1800

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page of GC20-1821-3 As Updated April 1, 1981 by TNt GN25-0840

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IThe recommendations in the VM/370 under VM/370 area and in the DOS/VSI
land OS/VS areas of this publication are meant to help an installation I
Igenerate operating systems that run more efficiently under VM/370. I
I I
, VM/370 users made many of these recommendations, and theirl
Isuggestions have not been submitted to any formal IBM ~est. As at
Iresult, potential users should evaluate the applicability of thel
Irecommendations to their installations before implementation.
L, _ _ _ __ I

Fo~