Page of GC20-1821-3 As Updated April 1, 1981 by TNL GN25-0840 OS/VS1 OS/VS2 VS1; OS/VS) OS/VS) p
page fault, pseudo, affected by VS1 handshaking processing 111
page tables, shadow table bypass
restrictions, for V=R users 34- 34. 1
page waits, VM/370 handling of, effect on
operating systems run under VM/370 11-12
page zero
in DOS Release 27, modifying to work in V=R virtual machine 74
shadow table bypass restrictions, for V=R users (2748-X]1) 34-34.1
using virtual=real option, to locate for
virtual machine operating systems 42 paging nonpaging mode)
activity, reducing for virtual machines
5
factors, affecting virtual machine
performance 5
virtual=real option
eliminating double paging 41-42 eliminating double paging 42-42.1 partition sizes, specifying for DOSjVS virtual machine 71-72 virtual machine; VM/370) 1SIM, usinq under VM/370 41
performance
for BTAM autopoll channel programs
executed under VM/370 8
guidelines
for operating systems run under VM/370 33-37
for operating systems run under VM/370 {5748-X]1} 34.5-37
interactive, emphasizing response time for 37 I/O waits, establishing processing priority 12
measurements, for both VM/370 and
virtual machines 37
multiple-access virtual machine,
considerations for 31
options
controlled by qeneral user 36
controlled by system operator for
system analyst 36
reducing page waits for operating
systems under VM/370 11-12
usinq for both VM/370 and virtual
machines 36
virtual machine, paging factors
affect ing EJ physical pack sharing, definition of 17
PID tape, restoring, for DOS/VS system
gen er ation under VM/370 73 generating for DOS/VS and DOS/VSE virtual machines 72 POWER/VS POWER) preparation, OS/VS, system generation under VM/370 116-117
printing dumps, for virtual storage
operating systems under VM/370 5
priority
establishing for operating systems under V l'I/37 0 for I/O waits 12
for page waits 11-12
priority option, performance option,
specifying for virtual machines 36
privileged instructions
reducing
effect on virtual machine performance
34
effect on virtual machine performance 34.5-34.6 for DOS/VS virtual machine 71
processor
dedicating to MVS V=R virtual machine (5748::.X]1) 138-138.2
model dependencies, effect on channel
error recovery procedures 13-14
reserve/release support, limitation
issuing reserve CCW commands to shared
minidisks 21
single real, reserve/release support for
22 VM/370 reserve/release support for,
reserving devices between 21
processor time, for DOS/VS virtual machine,
accounting for 73-74 PROFILE EXEC AUTOLOG facility, specifying for
(example) 48 AUTOLOG1 virtual machine, defining for AUTOLOG facility 47 pseudo timers, defining, by using SPECIAL control statement 45
R RCTLUNIT macro, VM/370 reserve/release
support, reserving devices between
processors 21 RDEVICE macro
defining hardware features for VM/370 alternate path support 20 defining real CTCA to ASP virtual
machine 33 VM/370 reserve/release support,
reserving devices between processors
21
REAL TIMER option
considerations for operating systems run
under VM/370 7
directory entry example: for VM/370 virtual machine 49 virtual timers, permitting operating
systems to update under VM/370 41 reduc ing
paging activity, for virtual machines 5
privileged instructions
effect on virtual machine performance
34
effect on virtual machine performance 34.5-34.6
for DOS/VS virtual machine 71
Index 145

Page of GC20-1821-3 As Updated April 1, 1981 by TNL GN25-0840 releasinq temporary minidisks, description
18
remote spooling communications subsystem RSCS) reserved devices
real VM/370 reserve/release support,
defining for 21
specifying VM/370 reserve/release
support between processors 21
reserved pages, performance option,
specifying for virtual machines 36
reserve/release support by VM/370 for DASD devices used by
operating systems 20-23 for dedicated volumes, example 22
for single real processors 22 RCTLUNIT macro, specifying for reserved
devices 21 RDEVICE macro, specifying for reserved
devices 21
real
definition of 20 mutually exclusive with VM/370 alternate path support 20 processing for DASD with alternate
path support 20-21 summary of VM/370 reserve/release
effect on 22-23
reserved devices, VM/370 generation and
usage considerations 21
shared min idisks, limita tion issuing ccw
commands to 21
summary 22-23
virtual
definition of 20 for users accessing same minidisk via
LINK control statements 21
specifyinq in MDISK control statement
21
summary of VM/370 reserve/release
effect on 22-23
using with VM/370 alternate path
support 20 response time, emphasizing performance for
under VM/370 37 restorinq contents of saved virtual
machine, using IPL command 42. 1 RSCS (remote spooling communications
subsystem) S VM/370 component, brief of
2
saved systems VM/370 for DOS/VS 70 for OS/VS 108 saving contents of virtual machine
using VMSAVE option 42.1
using VMSAVE option (2148-X]j) 42.1
second level directory SLD) second level storage, definition 5
segment tables
defining for a virtual operating system,
using SET STMULTI command 34.3-34.5
shadow table bypass restrictions, for V=R users 34
selective invalidation, of shadow tables
below high-water mark 34
service programs, VM/370, using 120-121 Service Record File (SRF) device,
formatting error recording area, for
printed output 4 SET command
enabling and disabling MVS/System Extensions support 42.2
shadow table support
defining concurrent tables for
virtual machines 33,34.3
defining hiqh-water mark for
selective invalidation 34
defining high-water mark for shadow
tables 34.1
eliminating tables for V=R virtual
machine users 34
selecting values for STBYPASS nnnnnK
operand 34.1-34.2
selecting values for STMULTI operand 34.3-34.4 STBYPASS nnnnnK operand for V=R users
(usaqe note) 34 STFIRST option permits use of STBYPASS nnnnnK operand 41 STMULTI operand for V=R users (usage
note) 34
specifying options
for virtual machine operatinq systems 40-42 for virtual machine operating systems 40 for virtual machine operating systems 40-42.2 shadow table maintenance support shadow tables; VM/370 System Extensions program product)
shadow tables
bypass function
for V=V users 34.1
specifying with SET STBYPASS command (.2148::.!]1) 34 V=R user usage and restrictions (2148::.!]1) 34 V=V user usage and restrictions 34.3
defining concurrent tables for virtual
machine
using SET STMULTI command 33,34.3-34.4
selectively invalidating below
high-water mark 34
shared DASD, VM/370 reserve/release support
for 20- 23
146 IBM VM/370 Operating systems a virtual Machine