z/VM Version 7 Release 2 Getting Started with Linux on IBM Z IBM SC24-6287-04 Note: Before you use this information and the product it supports, read the information in “Notices” on page 179. This edition applies to Version 7.2 of IBM z/VM (product number 5741-A09) and to all subsequent releases and modifications until otherwise indicated in new editions. Last updated: 2020-11-24 © Copyright International Business Machines Corporation 2004, 2020. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Figures................................................................................................................ vii Tables.................................................................................................................. ix About this document.............................................................................................xi Intended audience...................................................................................................................................... xi Conventions and terminology used in this document................................................................................ xi Where to find more information.................................................................................................................xii Additional publications......................................................................................................................... xii Links to other documents and websites.............................................................................................. xii How to send your comments to IBM.....................................................................xiii Summary of changes for z/VM Getting Started with Linux on IBM Z....................... xv SC24-6287-04, z/VM 7.2 (December 2020).............................................................................................xv SC24-6287-03, z/VM 7.2 (September 2020)............................................................................................xv SC24-6287-02, z/VM 7.1 (January 2020).................................................................................................xv SC24-6287-01, z/VM 7.1 (September 2019)............................................................................................xv SC24-6287-00, z/VM 7.1 (September 2018)...........................................................................................xvi Chapter 1. About z/VM...........................................................................................1 Example operating system configuration on a single mainframe.............................................................. 3 Overview of a single system image cluster................................................................................................. 3 Overview of the Control Program (CP).........................................................................................................5 Central processing units (CPUs).............................................................................................................5 Storage....................................................................................................................................................5 DASD and minidisks............................................................................................................................... 6 Temporary minidisks..............................................................................................................................6 Virtual disks in storage........................................................................................................................... 6 Virtual readers, punches, and printers.................................................................................................. 6 The virtual machine console.................................................................................................................. 6 Overview of the CP spool file system.....................................................................................................8 The user directory...................................................................................................................................9 Overview of the Conversational Monitor System (CMS)........................................................................... 12 Minidisks and the CMS access mode...................................................................................................12 CMS files............................................................................................................................................... 13 The PROFILE EXEC...............................................................................................................................14 The Help system...................................................................................................................................15 The CMS file editor XEDIT......................................................................................................................... 17 Input mode...........................................................................................................................................18 Overview of changing files................................................................................................................... 20 SAVE, FILE, QUIT, and QQUIT............................................................................................................. 21 Summary of Linux and z/VM similarities...................................................................................................22 Chapter 2. Planning for Linux virtual servers........................................................ 23 Overview of z/VM capacity planning......................................................................................................... 23 Memory and CPU requirements................................................................................................................ 26 Overview of estimating memory and CPU requirements.................................................................... 26 Guidelines for estimating the amount of DASD you need........................................................................ 28 iii DASD for z/VM paging.......................................................................................................................... 28 DASD for the Linux file system.............................................................................................................28 Planning your network...............................................................................................................................29 TCP/IP networking options for Linux................................................................................................... 29 Giving Linux virtual servers access to crypto resources for SSL acceleration......................................... 31 Planning for user management................................................................................................................. 32 Single system image clusters and live guest relocation...........................................................................33 Guidelines for LPAR, memory, and processors in an SSI cluster........................................................33 DASD guidelines and setup in an SSI cluster...................................................................................... 33 Guideline for saved segments in an SSI cluster..................................................................................35 Guidelines for planning your network in an SSI cluster......................................................................35 Planning your virtual server networks................................................................................................. 38 Crypto requirements in an SSI cluster.................................................................................................38 Tape requirements in an SSI cluster................................................................................................... 38 Guideline for user management in an SSI cluster...............................................................................38 Steps for planning your virtual servers..................................................................................................... 39 Steps for planning your SSI cluster...........................................................................................................39 Steps for obtaining documentation and media.........................................................................................45 Chapter 3. Changing the system configuration......................................................47 Steps for adding a paging, spooling, temporary disk, or user volume..................................................... 47 Steps for accessing the parm disk and creating a backup for SYSTEM CONFIG.....................................49 Steps for updating the CP-owned volume list.......................................................................................... 50 Steps for activating ISFC links between SSI members............................................................................ 53 Steps for updating the user volume list...................................................................................................