IBM Z/VSE Basics

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Front cover Introduction to the New Mainframe: IBM z/VSE Basics Mike Ebbers Wolfgang Bosch Hans Joachim Ebert Helmut Hellner Jerry Johnston Marco Kroll Wilhelm Mild Wayne O’Brien Bill Ogden Ingolf Salm Joerg Schmidbauer Martin Walbruehl Redbooks International Technical Support Organization Introduction to the New Mainframe: IBM z/VSE Basics March 2016 SG24-7436-01 Note: Before using this information and the product it supports, read the information in “Notices” on page xiii. Second Edition (March 2016) This edition applies to Version 6 Release 1 of IBM z/VSE, Program Number 5686-VS6, and to all subsequent releases and modifications. © Copyright International Business Machines Corporation 2007, 2016. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Notices . xiii Trademarks . xiv IBM Redbooks promotions . .xv Preface . xvii How this text is organized . xviii How each chapter is organized . xviii About the authors. xix Acknowledgements . .xx Comments welcome. xxi Summary of changes. xxiii February 2016, Second Edition . xxiii Part 1. Introduction to IBM z/VSE and the mainframe environment . 1 Chapter 1. Introduction to the new mainframe. 3 1.1 The new mainframe . 4 1.2 The IBM S/360: A turning point in mainframe history . 4 1.3 An evolving architecture . 5 1.4 Mainframes in our midst . 6 1.5 What is a mainframe? . 7 1.6 Who uses mainframe computers? . 9 1.7 Factors contributing to mainframe use . 10 1.7.1 Reliability, availability, and serviceability. 11 1.7.2 Security . 12 1.7.3 Scalability . 12 1.7.4 Continuing compatibility . 13 1.8 Typical mainframe workloads . 13 1.8.1 Batch processing . 14 1.8.2 Online transaction processing. 16 1.9 Roles in the mainframe world . 18 1.9.1 Who is the system programmer? . 19 1.9.2 Who is the system administrator?. 20 1.9.3 Who are the application designers and programmers? . 21 1.9.4 Who is the system operator? . 21 1.9.5 Who is the production control analyst? . 22 1.9.6 What role do vendors play? . 22 1.10 IBM z/VSE and other mainframe operating systems . 23 1.10.1 IBM z/VSE. 23 1.10.2 IBM z/VM . 24 1.10.3 IBM z/OS. 24 1.10.4 Linux for z Systems. 25 1.10.5 IBM z/Transaction Processing Facility . 25 1.11 Summary. 26 1.12 Questions for review . 27 1.13 Topics for further discussion . 27 © Copyright IBM Corp. 2007, 2016. All rights reserved. iii Chapter 2. Mainframe hardware systems . 29 2.1 Introduction to mainframe hardware systems . 30 2.2 Early system design . 31 2.3 Current design. 33 2.3.1 I/O connectivity . 34 2.3.2 System control and partitioning. 36 2.3.3 Characteristics of LPARs . 37 2.3.4 Consolidation of mainframes. 37 2.4 Processing units . 38 2.5 Multiprocessors . 40 2.6 Disk devices . 40 2.7 Typical mainframe systems. 42 2.7.1 Low to mid-range systems . 42 2.7.2 Larger systems . 43 2.8 Summary. 43 2.9 Questions for review . 45 2.10 Topics for further discussion . 45 2.11 Exercises. 45 Chapter 3. IBM z/VSE overview . 47 3.1 What is an operating system?. 48 3.2 What is z/VSE? . 48 3.2.1 PIE Strategy . 49 3.2.2 History of z/VSE . 52 3.2.3 Hardware resources used by z/VSE . 56 3.2.4 Multiprogramming and multiprocessing . ..

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