The two nonprivileged instructions are: CS (compare and swap) CDS (compare double and swap) VM/370 allows the compare instructions (CS and CDS) to execute normally; th·at is, it does not - sillula te them when t·he reai machine is equipped with the appropriate hardware feature. However, when MVS is run under VM/370 on a machine that does not have these instructions installed, VM/370 simulates them. Summary When loading OS/VS into a virtual machine, the terminal becomes the
as/Vs oFerator console, and the virtual machine user becomes the
operator responsible for entering all commands and responses. The three
basic techniques for running OS/VS in a virtual machine are: batch aode, alternating between as/vs and CMS in a single virtual machine, and
(for OS/VS2 users only) running OS/VS2 disconnected.
Before using one of these techniques, an installation must understand
how to: Generate OS/VS to run in a virtual aachine Create VK/370 directory entries for as/vs virtual machines Access the OS/VS system residence volume Ensure that the proper I/O devices are attached to the as/vs virtual
machine IPt and operate OS/VS under VK/370 The primary objectives when generating as/vs to run in a virtual machine should be to have all commonly used transient routines resident
in storage and to run all jobs V=R if possible. To meet these
objectives, an installation needs to consider how it generates both VM/370 and OS/VS. (asjVs can also be generated under VM/370.) To contrel OS/VS in a virtual maChine, use as/vs operator commands
to hold and release queues and jobs, and to start initiators or define
partitions. Users can observe the progress of the command's execution
by fellowing the OS/VS messages. Also, additional operator commands and
centre 1 stateaents must be entered at the console before running jobs on
the OS/VS virtual machine. OS/VS virtual machine users can use the CMS editor and the EXEC facility to prepare jobs for execution in an as/vs virtual machine.
They can also use eMS commands to develop and test programs on CMS disks.
138 IBM VM/370 operating Systems in a Virtual Machine
Page of GC20-1821-3 As Updated April 1, 1981 by TNL GN25-0840 Index The entries in this Index are accumulative. They list additions to this publication by
the following VM/370 System Control Program Products: VM/370 Basic System Extensions, Program Number 5748-XX8 VM/370 System Extensions, Program Number 5748-XE1 However, the text within the publication is not accumulative; it only relates to the one SCP proqram product that is installed on your system. Therefore, there may be topics and
references listed in this Index that are not contained in the body of this publication. #CP function CP function)
A
abend dump, printinq for virtual machines
5
accessinq
devices, bV VM/370 virtual machine 55
error records, for operating systems
under VM/370 4 accountinq ACCT option, generating job accounting
cards for virtual user 40 elapsed processor time, in DOS/VS virtual machine 73-74 ACCT option, OPTION control statement,
accounting considerations unique to
operatinq systems 40 allocating space CP disks, for VM/370 virtual machine 53-54 for temporary disks, with CP format/allocate program 17-18
alternate consoles, specifying for virtual
machine 14-15 alternate path support
defining hardware features to VM/370, using RDEVICE macro 20 for viLtual machines 19-20 mutually exclusive with real
reserve/release support 20 real VM/370 reserve/release support for
dedicated DASD 20-21 restriction, not for real reserved
devices 21
summary of VM/370 reserve/release effect
on 22-23
alternating between operating systems alternatinq technique)
alternatinq technique
between virtual machine operating
systems
for CMS and OS/VS 133-135
for DOS/VS and CMS 94-100 for operating systems 24-26 application programs
designing to run efficiently under VM/370 4 developing and testing
using alternating technique between CMS and operating system 24-26
using OS/VS virtual machine 137
timer-driven, specifying REALTIMER
option for 41 VIRT=REAL option
using for 41-42 using for (5748-XE1) 42-42.1 ASP virtual machine
connecting with real ASP machine 32-33
using virtual CTCA, to connect two
virtual machines 31
attached processors, dedicating to MVS V=R virtual machine 138-138.2 AUTOLOG command
defining AUTOLOG facility, in AUTOLOG1 virtual machine 47 use with AUTOLOG facility 46 AUTOLOG facility 46-48 AUTOLOG1 virtual machine
defining for multiple systems 48 defining for single system 47-48 defining in VM/370 directory 47 logging on users automatically, using CP AUTOLOG command 46 AUTOLOG1 AUTOLOG facility)
autopoll, channel program, bypassinq when
using BTAM under VM/370 8
B
batch mode
for DOS/VS virtual machine, using 93
for OS/VS virtual machine, using 132
batch virtual machine
operating systems supported under VM/370 2 . using under VM/370 3 BMX option, using block multiplexer
channels, for virtual machine operating
systems 6.1
BTAM, autopoll channel program, VM/370 checking and bypassing for 8
Index 139
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