GC20-180 1 -0 IBM Virtual Machine Facility /370: Systems Planning Guide This publication is intended for those responsible for the planning and installation of a VM/370 system. It includes information on virtual machine concepts, operating sys­ tems in a virtual machine, and planning considerations for a VM/370 installation. The publication IBM Virtual Machine Facility/370: Introduction, Order No. GC20- 1800, is a prerequisite for understanding this planning guide. Preface 'This publication provides the people responsible for plan­ ning and installation of a VM/370 system with the infor­ mation they need to determine the facilities and support personnel that will be required. All readers should have a general understanding of System/370 data processing techniques. Those responsi­ ble for installing and operating the VM/370 system should have a more detailed knowledge about teleprocessing sys­ tems. In addition, all users of this book should be familiar with the information contained in the publication IBM Virtual Machine Facility/370: Introduction, Order No. Ge20-1800. This book is divided into four main sections, plus Ap­ pendixes. "Section I: Introduction" contains a brief description of VM/370 and its operating components. "Section 2. CMS Considerations" supplies the reader with detailed information about the Conversational Mon­ itor System (CMS), a virtual machine operating system that is part of V1I1/370. "Section 3. Operating Systems-General Information" discusses several important considerations for all virtual machine operating systems. "Section 4. Pre-System Generation Planning" describes the facilities and planning required to prepare to install a VM/370 system. The Appendixes provide further details about particu­ lar aspects of V1I1/370, and are titled accordingly. When the term 3330 is used in this publication, it refers to the IBM 3330 Disk Storage, Modell or the IBM 3333 Disk Storage, Modell. First Edition (Avgust 1972) Changes are continually made to the specifications herein; before using this publication in con­ nection with the operation of IBM systems, consult the latest System/360 and System/370 SRL Newsletter, GN20-0360, for the editions that are applicable and current. Requests for copies of IBM publications should be made to your IBM representative or to the IBM branch office sl;lrving your locality. A form for readen' comments is provided at the back of this publication. If the form has been removed, comments may be addressed to IBM Corporation, Programming Publications Dept. 545 Technology Square, Cambridge, Massachusetts 02139. Comments become the proper- ty of IBM. © Copyright International Business Machines Corporation 1972 Contents SECTION 1. INTRODUCTION........................................... 7 Virtual Machine Definition. 7 Simulating the System Control Panel at a Remote Terminal. 7 Virtual I/O Operation. 7 Spooled Device Operation. 7 Sending and Receiving System Console Messages. 8 Changing a User's Virtual Machine Configuration . 8 Minidisks. 8 Dedicated Real Devices . 8 SECTION 2. CMS CONSIDERATIONS ................................... ~ . 9 Operation and Support ............................................ ~ . 9 CMS Program Language Facilities ................................... f .. 10 CMS File System .............................................. ~ .. 11 CMS Disk File Conventions ....................................... : .. 11 CMS Disk Format. • .. 11 File Format ................................................. ! .. 12 Automatic Space Allocation for Temporary Work Files ....................... ~ .. 12 Disk Access . .. 12 File Identifiers. .. 13 Filename. .. 13 Filetype . .. 13 Filemode. .. 14 File Access-Order of Search . .. 14 CMS Libraries . .. 15 CMS Tape Support. .. 15 CMS Tape-Handling Commands. .. 16 CMS Unit Record Support. .. 16 Card Reader. .. 16 Card Punch . .. 16 Printer. .. 16 Editing. .. 16 Execution Control. .. 17 CMS Interactive Execution. .. 17 OS Macro Simulation Under CMS . .. 17 OS Data Management Simulation. .. 18 The FILEDEF Command ...... '. .. 18 CMS Debugging. .. 19 CMS Storage Requirements. .. .. 19 Virtual Storage. .. 19 Auxiliary Storage . .. 19 CMS Command Language Extensions. .. 19 CMS Command Search. .. 20 CMS Command Abbreviations ...................................... " 20 The EXEC Processor. .. 20 PROFILE EXEC Procedures. .. 21 Adding User-Written Commands. .. 21 CMS EXEC Procedures. .. 21 CMS Batch Operation . .. 21 SECTION 3. OPERATING SYSTEMS-GENERAL [NFORMATION . .. 23 Operation of a Batch Virtual Machine ...... ' . .. 23 Reading Cards in a Virtual Machine . .. 24 Printing and Punching in a Virtual Machine. .. 25 Minidisks . .. 26 General Information . .. 26 Space Allocation. .. 26 TraGk Characteristics. .. 26 Alternate Tracks. .. 26 Labels. .. 28 Channel Switching . .. 28 Reserve:/Release ................................................ ',' ., 28 Disconnecting the Remote Terminal. .. 29 The Multiple-Access Virtual Machine. .. 29 The ASP Virtual Machine ....... :'. .. 31 Using Multiple Consecutive Operating Systems .. .. 32 Performance Guidelines. .. 34 General Information . .. 34 Virtual Machine I/O. .. 34 Paging Considerations . .. 35 Locked Pages. .. 35 The: Reserved Page Frames Option . .. 36 The: Virtual= Real Option . .. 36 CPU Resources . .. 36 Queue I (Q1). .. 36 Queue 2 (Q2). .. 37 Multiprogramming Systems Under VM/370. .. 37 SECTION 4. PRE-SYSTEM GENERATION PLANNING . .. 39 Configurations. ..