Paqe of GC20-1821-3 As Updated April 1, 1981 by TNL GN25-0840 Sample DOS/VS Directory Entries. • • • • 82
Accessing DOS/VS • • • • • • • • • • • • 82 Sharing the DOS/VS System Residence Volume. • • • • • • • • • • • • • 83
Standard Label Cylinder. • • • • ••• 83 Using virtual Unit Record Devices •••• 84
Defining the Operator's Console. • 85
preparing Jobs for a DOS/VS Virtual Machine • • • • • • • 85
Loading DOS/VS • • • • • • • • • • • 86 IPL from the Console • • • • • • • 86 IPL from the Card Reader • • 89 DOS/VS Operation • • • • • • 90 Starting a Job Stream. • • 91 When a Job Is Finished. • • • 91
Communicating with CP. • • 91
Running Batch DOS/VS Under VM/370. • 93
Alternating Between CMS and DOS/VS Under VM/370. • • • • • • • • • • • • • • 94
Loading CMS into a Virtual Machine • • 94 Using the CMS Editor To Prepare Jobs • 94
Issuing SPOOL Commands To Control unit
Record Devices. • • • 95 Punching CMS Files • • • 96
Initializing DOS/VS. • • 96 Signaling DOS/VS To Read the Job Stream. • • • • • • • • • 97
Reloading CMS into a Virtual Machine • 98
Examining DOS/VS Virtual Machine Output. • • • • • • • • • • • • • 98 Using EXEC Procedures ••••••••• 99 Using More Than One virtual Machine ••• 100 Accessing CMS. • • • • • • • .101 Disconnecting CMS. • • • • • • • .101 Logqinq Onto DOS/VS. • • • •• • .101 Returninq to CMS • • • • • • • .102 Disconnection Considerations. • .102 Developing and Testing Programs to Run
in a DOS/VS Virtual Machine •••••• 104 Summary. • • • • • • • • • • • • • .105 SECTION 4. OS/VS IN A VIRTUAL MACHINE •• 107 System Generation Recommendations •••• 107 VM/370 Recommendations. • .108 OS/VS Recommendations. • • • .108 OS/VS 1 Recommendations • • • • 109 VM/VS Handshakinq for VS1. • .110 IBM 3850 Mass storage System Considerations. • • • • • • • • 115
Generating OS/VS Under VM/370. • .115 Preparing for OS/VS System Generation. 116
Initializing the Starter System Volume •••••••••••••••• 117
Restoring the Starter System to Disk .119
Loading the Starter System. • • .119
Restoring Distribution Libraries to
Disk. • • • • • • • • • • • •• .119
creating Card Decks for Utility
Programs. • • • • • • • • • •• .120 Initializing the System Residence Volume •••••••••••••••• 120 VM/370 Utility Programs ••• ' ••••• 121 Stage I processing in the CMS Virtual Machine. • • • • • • • .121 Stage II Processing. • • • • • • .123
Final Housekeeping. • • • • • • .124 Sample OS/VS Directory Entries. .124
Accessing OS/VS. • • • • • • • • .126 Using Virtual Devices. • • • • • .127
Defining the Operator's Console. .127 Using the VM/370 Spool File System •• 128
Preparing Jobs for an OS/VS Virtual Machine. • • • • • • • • • • • .128
Job Entry and Output Retrieval •••• 129
Loading OS/VS. • • • .129 OS/ VS Operation. • • • • • • • • • 130 Commu nicating with CP. • • • • • • 131 Using OS/VS in Batch Mode Under VM/370 .132
Alternating Between CMS and OS/VS Under VM/370 ••••••••••••••••• 133
Loading CMS into a Virtual Machine •• 133 Using the CMS Editor To Prepare Job Streams ••••••••••••••• 133
Issuing Spool Commands to Control' Unit Record Devices. .134
Punching CMS Files • • • • • • • 134
I nizializing OS/VS • • • • • • • 134
Reloading CMS into a Virtual Machine .134
Examining OS/VS Virtual Machine Output ••••• •••••••••• 135
Dynamic SCP Transition to or from
Native Mode • • • • • .135 Operating Procedures .136
Error Recording ••••• 136.1 Using More than One Virtual Machine.. 136 Using More than One Virtual Machine • • • • • • • • • • .136.1
Disconnection Considerations. • .136
Disconnection Considerations
(5748-XE1). • • • • • • • • • .136.2
Developing and Testing Programs to Run
in an OS/VS Virtual Machine. •• .137 OS/VS2 MVS Uniprocessor Under VM/370 •• 137 Use of Single Processor Mode in AP and MP Systems (274§-XEj) ••••••••• 138 Operating Procedures . ... 138
Error Recording (5148-ZE1) ••••• 138.1
Taking a VM/370 Dump ••• 138.2 Sum mary. • • • • • • • 138 Summary (5748-XE1) .138.2 INDEX. • • • • • • •• 139
vi VM/3 7 0 operating Systems in a virtual Machine

FIGUltES Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Eight Paths to a Single Device ••••••••••••••••••••••• 19 Su •• ary of VM/370 Reserve/Release Support •••••• 23 OS Job Stream Transfer ••••••• 25
Directory Entry for
Alternating Between
operating Syste.s •••••••••••• 25 Virtual Devices: Local
3270 Ter.inals ••••••••••••••• 27 Virtual Devices: Remote
Terminals •••••••••••••••••••• 27 A Virtual VM/370 Kultiple-
Access •••••••••••••• 28 VM/370 Directory Entry for
a Multiple-Access Virtual Machine •••••••••••••••••••••• 29
A Communica tions Test System ••••••••••••••••••••••• 29
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18. A virtual 2703 TCU Controlling Remote 3270
Terminals ••••••••••••• •••••• 31
Two ASP Virtual Machines ••••• 31 One Real and One Virtual . . ASP Machine ••••••••••.••••••• 32
Relationship of VM/370 Directory Entries •••••••••••• 39 Virtual=Real Machine, ••••••••• 42 Virtual Machine for DOS/VS System Generation ••••••• •••• 75
IPL DOS/VS and Execute a
Job in the Card Reader •• •••• 88 Virtual Machines of OS/VS System Generation •• ••••••• 116 Sample IPL of VS1 under VM/370 •••••••••••••••• 130
Contents vii