An introduction to z/VM Single System Image (SSI) and Live

136 Pages·2016·1.64 MB·English

Front cover
An introduction to z/VM Single
System Image (SSI) and Live
Guest Relocation (LGR)
Learn about the business benefits of
SSI and LGR
Understand important concepts
and planning
Step through implementation
and practical approaches
Lydia Parziale
Anthony Bongiorno
Howard Charter
Jo Johnston
Volker Masen
Clovis Pereira
Sreehari Somasundaran
Srivatsan Venkatesan
ibm.com/redbooks
International Technical Support Organization
An introduction to z/VM Single System Image (SSI) and
Live Guest Relocation (LGR)
April 2012
SG24-8006-00
Note: Before using this information and the product it supports, read the information in “Notices” on
page vii.
First Edition (April 2012)
This edition applies to Version 6, Release 2, of z/VM.
© Copyright International Business Machines Corporation 2012. 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
The team who wrote this book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Now you can become a published author, too! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Comments welcome. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Stay connected to IBM Redbooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Chapter 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Business benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1.1 Simplified z/VM systems management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1.2 Share system resources with high resource utilization . . . . . . . . . . . . . . . . . . . . . . 2
1.1.3 Non-disruptive maintenance and upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1.4 Concurrent support for disparate environments . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Navigating the z/VM library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 z/VM V6R2.0 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.2 z/VM V6R2.0 Installation Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.3 z/VM V6R2.0 CP Planning and Administration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.4 z/VM V6R2.0 Getting Started with Linux on System z . . . . . . . . . . . . . . . . . . . . . . 4
1.2.5 z/VM V6R2.0 VMSES/E Introduction and Reference . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.6 z/VM V6R2.0 Directory Maintenance Facility Commands Reference. . . . . . . . . . . 5
1.2.7 z/VM V6R2.0 Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2.8 z/VM V6R2.0 CP Commands and Utilities Reference . . . . . . . . . . . . . . . . . . . . . . 6
1.2.9 z/VM V6R2.0 Migration Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 2. Single system image (SSI) overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Introduction to the z/VM single system image (SSI) clusters . . . . . . . . . . . . . . . . . . . . 10
2.2 Major attributes of the z/VM SSI cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.1 z/VM installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.2 Changes to applying service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.3 Workload balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.4 Single configuration users and multiconfiguration users. . . . . . . . . . . . . . . . . . . . 11
2.2.5 DASD requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2.6 Network requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.7 Equivalency identifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2.8 MAC addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.2.9 New user IDs for z/VM 6.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.2.10 Persistent data record. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.2.11 VMSSI considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3 Planning considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.1 Logical partition (LPAR) planning considerations . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.2 DASD planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.3 ISFC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.3.4 Non-SSI z/VM installation planning considerations. . . . . . . . . . . . . . . . . . . . . . . . 20
2.4 z/VM SSI cluster operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.4.1 SSI member states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.4.2 SSI cluster modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
© Copyright IBM Corp. 2012. All rights reserved. iii
Chapter 3. Live guest relocation (LGR) overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1 Introducing live guest relocation (LGR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.2 Major attributes of live guest relocation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.2.1 Factors affecting relocation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.3 Supported configurations for relocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.4 Memory and paging considerations for live guest relocation . . . . . . . . . . . . . . . . . . . . 26
3.5 Relocation domains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.5.1 Characteristics of relocation domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.5.2 Steps for defining relocation domains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.5.3 Steps for placing virtual servers into relocation domains . . . . . . . . . . . . . . . . . . . 31
3.6 Performing a relocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.6.1 VMRELOCATE command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.6.2 Performing the relocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.7 Conditions that prevent a relocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Chapter 4. Scenario one: Creating a single system image cluster with four new z/VM
members . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.2 Setting up the SSI cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.2.1 Planning worksheet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.2.2 Hardware definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.2.3 Defining the software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.2.4 Configuring the DASD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.2.5 Configuring the network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.2.6 Guests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.3 Installation process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.3.1 Instplan command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4.3.2 INSTALL command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.3.3 INSTSCID command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.3.4 Configuring the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.3.5 Setting up the software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.4 Relocation examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.4.1 Live guest relocation for Linux on System z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.5 Problems encountered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.6 Lessons learned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Chapter 5. Scenario two: Converting two existing stand-alone z/VM systems to a single
system image cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
5.1.1 Preparing and executing scenario two . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5.2 Setting up ITSOSSI5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.2.1 Planning worksheet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.2.2 Defining the hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.2.3 Defining the software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
5.2.4 Installing the z/VM stand-alone client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
5.2.5 Installing additional software products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
5.3 Setting up ITSOSSI6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
5.3.1 Defining the hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.3.2 Defining the software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.3.3 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.4 Converting ITSOSSI5 to a member of an SSI cluster . . . . . . . . . . . . . . . . . . . . . . . . . . 69
5.4.1 Setting RACF to use as a shared database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
5.4.2 Completing the conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
5.5 Creating an ITSOSSI6 system by cloning ITSOSSI5 . . . . . . . . . . . . . . . . . . . . . . . . . . 70
iv An introduction to z/VM Single System Image (SSI) and Live Guest Relocation (LGR)
5.5.1 Cloning ITSOSSI5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
5.6 Suggestions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
5.7 Relocation examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
5.7.1 Live guest relocation of a z/VM guest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
5.7.2 Relocating an SAP system in a typical System z setup . . . . . . . . . . . . . . . . . . . . 79
Appendix A. Frequently asked questions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
A.1 Guests do not relocate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
A.1.1 Linux with a DEVNO minidisk in use elsewhere . . . . . . . . . . . . . . . . . . . . . . . . . . 88
A.1.2 Linux with CMS mdisks defined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
A.1.3 Using a LINUX guest with V-Disk minidisk definition . . . . . . . . . . . . . . . . . . . . . . 90
A.1.4 Moving a CMS guest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
A.1.5 Using DEDICATE devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
A.1.6 Live guest relocation of zLinux guests outside domains. . . . . . . . . . . . . . . . . . . . 97
A.1.7 Relocation exceeds MAXQUIESCE time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
A.1.8 Relocation exceeds available auxiliary paging space. . . . . . . . . . . . . . . . . . . . . . 99
A.1.9 Relocation exceeds available capacity of storage . . . . . . . . . . . . . . . . . . . . . . . 100
A.2 LPAR names are the same on separate CECs in the cluster . . . . . . . . . . . . . . . . . . . 101
A.3 Incorrect system name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
A.4 Recovery messages on the Linux console during relocation . . . . . . . . . . . . . . . . . . . 102
Appendix B. New and updated commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
B.1 Single system image and live guest relocation commands . . . . . . . . . . . . . . . . . . . . 106
B.2 DIRMAINT commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
B.2.1 Adding identities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
B.2.2 Getting identities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
B.2.3 Using prototypes and batch functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
B.3 VMSES commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Appendix C. Additional material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Locating the web material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Using the web material. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
System requirements for downloading the web material . . . . . . . . . . . . . . . . . . . . . . . 113
Downloading and extracting the web material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Related publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Other publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Online resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Help from IBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Contents v
vi An introduction to z/VM Single System Image (SSI) and Live Guest Relocation (LGR)
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any form without payment to IBM, for the purposes of developing, using, marketing or distributing application
programs conforming to the application programming interface for the operating platform for which the sample
programs are written. These examples have not been thoroughly tested under all conditions. IBM, therefore,
cannot guarantee or imply reliability, serviceability, or function of these programs.
© Copyright IBM Corp. 2012. All rights reserved. vii
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viii An introduction to z/VM Single System Image (SSI) and Live Guest Relocation (LGR)