SAP on IBM Z IBM Business Continuity for SAP on IBM Z Edition 2019 SC33-8206-11 SAP on IBM Z IBM Business Continuity for SAP on IBM Z Edition 2019 SC33-8206-11 Note Before using this document and the product it supports, be sure to read the information in “Notices” on page 319. Edition notice This edition of Business Continuity for SAP on IBM Z applies to the following software components and to all subsequent releases and modifications until otherwise indicated in new editions: v SAP NetWeaver 7.5 and 7.4 based on 7.4x Downward Compatible Kernel (DCK), and SAP NetWeaver 7.1, 7.2, and 7.3 based on 7.2x DCK levels | v z/OS Release 2.2 and higher supported z/OS releases | v AIX Release 7.1 and higher supported versions v Linux on IBM Z v Linux on System x v Windows Server 2008 R2 and higher supported versions v IBM DB2 11 for z/OS v IBM Db2 12 for z/OS v IBM System Automation for z/OS version 3.5 v IBM System Automation for z/OS version 4.1 IBM welcomes your comments. 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Contents Figures .............. vii z/OS VIPA usage for the high availability solution for SAP................ 55 Tables ............... ix Considerations when running the AS to DB and SCS connections over a private subnet ....... 56 Timeout behavior of the client/server connection Summary of changes in edition 2019 .. xi over TCP/IP .............. 56 Summary of changes in edition 2018 ...... xi Timeout behavior of the AIX application server 56 Summary of changes in edition 12/2016..... xii Timeout behavior of the Linux application server 59 Timeout behavior of the Windows application About this document ........ xiii server ............... 60 Content of this document ......... xiv Timeout behavior of Db2 client connections .. 61 Timeout behavior of the database server.... 62 Chapter 1. Introducing high availability SAP maximum transaction time ...... 64 and automation for SAP ........ 1 High availability definitions ......... 3 Chapter 5. Concepts for a high Degrees of availability .......... 3 availability SAP solution ....... 65 Types of outages ............ 3 Prerequisites and planning ......... 65 The autonomic computing self-healing technologies Architecture components .......... 65 of IBM System Automation ......... 4 SAP Central Services .......... 66 High availability and automation objectives for SAP 5 Network .............. 70 Overview of the high availability solution for SAP.. 6 File system ............. 74 Conventions and terminology used in this document 8 Database .............. 77 Application design ........... 79 Chapter 2. SAP availability benefits Failure scenarios and impact......... 79 provided by IBM Z .......... 11 Features of z/OS ............ 11 Chapter 6. Preparing a high availability Availability features and benefits with IBM Z SAP solution ............ 85 Parallel Sysplex ............. 12 Software prerequisites ........... 86 Db2 data sharing on IBM Z Parallel Sysplex ... 13 Naming conventions ........... 87 Db2 connection failover .......... 15 Naming conventions for IBM System Automation Db2 connection failover for ABAP instances .. 16 for z/OS .............. 87 Db2 connection failover for Java instances ... 18 Naming conventions used in the SA z/OS policy 90 Building blocks for Db2 connection failover .. 19 Setting up Db2 ............. 90 Setting up file systems under z/OS for local and Chapter 3. Planning for high availability NFS exported file systems ......... 91 for SAP .............. 21 File systems ............. 91 Setting up zFS file systems ........ 93 Possible preparation stages of high availability for SAP directory definitions ......... 94 SAP ................. 21 NFS server on z/OS .......... 96 Automating using System Automation for z/OS .. 23 NFS clients general information ...... 99 Technologies on IBM Z for highly available SAP Non z/OS NFS server .......... 99 solutions ............... 25 Configuring Sysplex performance monitoring Disaster recovery ............ 29 highly available with the RMF Distributed Data Data sharing considerations for disaster recovery 29 Server (RMF DDS)............ 100 Modifying the environment for AIX and for Linux Chapter 4. Network characteristics for on IBM Z............... 101 high availability ........... 37 Modifying the environment for AIX ..... 102 Network considerations .......... 37 Modifying the environment for Linux on IBM Z 103 General recommendations ......... 38 Recommendations for sysplex failure management Db2 connection failover recovery mechanism ... 43 (SFM) policy definitions .......... 104 OSPF protocol as a recovery mechanism..... 43 Setting up IBM System Automation ...... 105 Virtual IP Address (VIPA) as a recovery mechanism 44 SAP installation planning considerations .... 105 Recommended setup for high availability SAP licenses............. 105 connections between client and server ..... 46 SAP logon groups ........... 106 Alternative network setup ......... 51 © Copyright IBM Corp. 2004, 2019 iii Chapter 7. Customizing SAP for high Class structure ............ 148 availability............. 107 SAP infrastructure group ......... 151 General installation recommendations ..... 108 SAP system-dependent groups ....... 154 Installation sequence .......... 108 ABAP central services and enqueue replication Setting up ABAP SCS, Java SCS, and ERS instances 109 server ................ 155 Installing SAP Central Services and enqueue Dependencies between the ABAP enqueue replication server on z/OS ........ 111 server and the enqueue replication server ... 158 Installing the enqueue replication server as an Optional component of the ABAP central ERS instance............. 111 services .............. 160 Installing Central Services and its enqueue Java central services and enqueue replication replication server with ZSCSinst ...... 112 server ................ 160 | Installing Central Services and activate Coupling Monitoring the health state of SAP enqueue | Facility replication ........... 114 replication .............. 162 Additional mandatory manual modifications SAP HA Interface for SA z/OS ....... 164 after ASCS installation ......... 115 Db2 policy .............. 166 Verifying ABAP SCS with enqueue replication 117 SAP application servers as proxy resources ... 168 Additional mandatory manual modifications Creating a remote application server policy .. 169 after Java SCS installation ........ 118 Scripts for the remote application server policy 170 Verifying Java SCS with enqueue replication .. 119 Details and configuration for application servers SAP profile parameters ......... 121 as proxy resources........... 171 Installing SAP primary and additional application Groups, applications, and relationships ..... 177 server instances ............ 123 Installing the SAP primary application server Chapter 9. Verifying your instance .............. 124 implementation on z/OS ....... 181 Installing additional SAP application server Verification procedures and failover scenarios .. 181 instances (Java-only) .......... 124 Overview of the test scenarios....... 181 Performing SAP post installation steps for high Test methodology ........... 185 availability ............. 125 Planned outage test scenarios ....... 194 The SAP Web Dispatcher ......... 126 Unplanned outage test scenarios ...... 204 Installing the SAP Web Dispatcher ..... 126 Problem determination methodology ..... 222 SA z/OS policy for the SAP Web Dispatcher 128 SA z/OS problem determination ...... 223 The Solution Manager Diagnostics Agent (SMDA) 129 Where to check for application problems ... 226 Installing the SMDA instance ....... 129 Checking the network ......... 228 Deleting an SMDA instance ....... 130 Checking the status of zFS file systems and NFS 230 Preparing SAP on z/OS for automation .... 131 Checking the status of Db2 and SAP Preparing the C-shell and logon profiles ... 131 connections ............. 231 ABAP SAP Central Services (ASCS) ..... 131 Java Central Services (SCS) ........ 132 Chapter 10. Operating an SAP system ABAP application server instances ..... 132 under System Automation control .. 233 Java and dual-stack application server instances 136 Managing an SAP system ......... 233 SAP host agent ............ 137 Stopping an SAP system with SA z/OS ... 233 SAProuter ............. 138 Starting an SAP system with SA z/OS .... 235 Summary of start, stop, and monitoring Checking the replication status ...... 236 commands ............. 138 Change management during SAP operation ... 236 Updating Db2 or z/OS ......... 237 Chapter 8. Customizing System Switching database connections for a single SAP Automation for z/OS ........ 141 application server ........... 238 Preparing SA z/OS for SAP high availability ... 142 Switching database connections for multiple How to send UNIX messages to the z/OS SAP ABAP application servers....... 250 syslog ............... 143 Change management on z/OS UNIX ...