Implementing SAP R/3 Using Microsoft Cluster Server

Overview

The complete, expert guide to running SAP R/3 on Microsoft Cluster Server.

  • For companies running IBM Netfinity Servers and Windows NT Server/Windows 2000
  • Describes how to implement a fault-tolerant ...
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Overview

The complete, expert guide to running SAP R/3 on Microsoft Cluster Server.

  • For companies running IBM Netfinity Servers and Windows NT Server/Windows 2000
  • Describes how to implement a fault-tolerant SAP R/3 configuration
  • Covers integration of the three major databases: Oracle, IBM DB2 UDB, and Microsoft SQL Server
  • Discusses certification, hardware sizing, disk layout, network configuration, and performance tuning
  • Includes information on Windows 2000
  • Provides step-by-step installation instructions including worksheets to complete
  • Step-by-step coverage of installing SAP R/3, Microsoft Cluster Server, and Oracle, DB2 UDB, or Microsoft SQL Server
  • Complete hardware coverage: hardware certification, server sizing, disk layout, network configuration, and more
  • Verification and troubleshooting: practical advice and hands-on techniques

For thousands of companies, one application is more business critical than any other: SAP R/3. In this book, a team of IBM's top support professionals shows exactly how to maximize the availability and performance of SAP R/3 systems running on Microsoft Cluster Server on IBM's powerful Netfinity servers.

You'll find thorough coverage of the entire system lifecycle: planning, implementation, tuning, and maintenance. The book contains an invaluable step-by-step walkthrough of installation and configuration on Netfinity servers, including specific techniques for integrating three leading databases: Oracle, DB2 UDB, and SQL Server.

The book presents detailed hardware coverage, including server sizing, disk layout, backbonenetwork configuration, and more. IBM's experts offer detailed, never-before-published techniques for verifying an installation-as well as tips for troubleshooting and problem resolution. If you're involved in planning or installing SAP R/3 and Microsoft Cluster Server on IBM Netfinity servers, you'll find this book an invaluable resource.

Sharing Technical Expertise from Around the World

This book and other IBM Redbooks are products of IBM's International Technical Support Organization, where worldwide specialists work alongside you to harness IBM technologies. IBM Redbooks make the answers to your most pressing technical questions easily and immediately accessible.

For more information: www.redbooks.ibm.com

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Product Details

  • ISBN-13: 9780130198471
  • Publisher: Prentice Hall Professional Technical Reference
  • Publication date: 5/11/2000
  • Edition number: 1
  • Pages: 328
  • Product dimensions: 7.04 (w) x 9.26 (h) x 0.89 (d)

Read an Excerpt

Chapter 1: Introduction

High availability in computing is defined as making a business application set available to the users as high a percentage of the time as possible.

This simple statement covers a lot of ground. It can be as simple as planning for the loss of electrical power for a piece of equipment, or as disastrous as a fire and earthquake, which can cause the loss of the entire computing site.

Murphy's Law says anything that can go wrong will. The space shuttle is built on this premise. All critical systems have one or more redundant backup systems. In case of a failure, the backup system automatically takes over the function of the failed primary system. Fault tolerance is the concept that a system can survive any failure in a hardware or software component and continue to function. This obviously will help to maintain the high availability we are looking for in our business applications.

This same idea is used in designing high availability into computer systems supporting business-critical applications. For example, a mail order business comes to a screeching halt if the order entry application becomes unavailable to the users for any reason.

1.1 Clustering - a means to an end

Clustering is the use of two or more computers or nodes for a common set of tasks. If one computer fails, the others will take up the slack. This design supports the idea of fault tolerance. A second computer can be used as the redundant backup for the first computer.

Clustering can be used to increase the computing power of the entire computer installation. This also allows a system to be scalable. Adding more computers increases the power and hence the designcan support more users. In our case, we use clustering for application availability with increasing processing power as a fortunate side effect.

1.2 What clustering provides

The current range of clustering solutions allows for a level of fault tolerance. The degree to which failures can be tolerated depends largely on two things:

1. The location of the failure

If the failure is within the cluster (for example, failed hardware in a node or a trapped operating system), then the high availability software will probably be able to recover and continue servicing its users. If the failure is outside the cluster, it is less likely that the high availability software will be able to maintain service. Failures such as power distribution failures, complete network outages, and data corruption due to user error are examples of faults that cannot be contained by products such as Microsoft Cluster Server.

2. The ability of applications to cope with the failure

Microsoft Cluster Server, for example, allows applications and resources that were running on a failed system to be restarted on the surviving server. For "generic" applications, this is simply a matter of restarting the program. For more complicated applications (for example, SAP R/3 servers), there must be a certain sequence to the restart. Certain resources, such as shared disks and TCP/IP addresses, must be transferred and started on the surviving server before the application can be restarted. Beyond that, other applications (for example database servers) must have clustering awareness built into them so that transactions can be rolled back and logs can be parsed to ensure that data integrity is maintained.

Microsoft Cluster Server provides high availability only. The Microsoft solution does not as yet address scalability, load balancing of processes nor near-100% up time. These can currently be achieved only through more mature clustering, such as that which is implemented in RS/6000 SPs.

Microsoft also offers its Windows Load Balancing Service, part of Windows NT 4.0 Enterprise Edition. It installs as a standard Windows NT networking driver and runs on an existing LAN. Under normal operations, Windows Load Balancing Service automatically balances the networking traffic between the clustered computers.

1.3 Business data - to replicate or not?

Adding computers, networks and even cloning entire computer centers for fault tolerance purposes does not solve all the problems. If the business is relatively unchanging, the databases can be replicated along with the rest of the system. Any updates can be accomplished for all the replicated copies on a scheduled basis. An example of this is a Web server offering product information to customers. If one Web server is down the other servers can serve the customer. In this example the cluster is used for both performance and availability.

On-tine Transaction Processing (OLTP) applications have different data requirements. As the name implies the data is always changing based on business transactions. A customer places an order for a product. Inventory is allocated to the order and is then shipped from the warehouse to the customer. If this data is replicated, there would be the possibility of promising the same item to two different customers. Somebody would be unhappy.

1.4 Disk sharing

Shared disks is one of the cluster architectures in the industry today. It may be used for scalability as well as for high availability purposes. In a typical two-node high availability cluster, both nodes can access the same storage devices, but only one server at a time controls the storage devices shared by both servers. If one server fails, the remaining server automatically assumes control of the resources that the failed server was using, while still controlling its own resources at the same time. The failed server can then be repaired offline without the loss of time or work efficiency, because access to that server's data and applications is still available.

The key point is that only one server has control of the storage devices at any point in time. There is only one copy of the data, so data accuracy is maintained.

1.5 MSCS-based solutions

As part of the early adopter's agreement with Microsoft, IBM has announced validated solutions of hardware and software to enable customers to run Microsoft Cluster Server (MSCS) in a shared disk environment.

For managing Microsoft Cluster Server configurations, IBM has developed IBM Cluster Systems Management (ICSM). It provides portable, generic cluster systems management services that integrate into existing systems management tools such as IBM Netfinity Manager, Intel LANDesk, and Microsoft SMS.

ICSM offers enhancements to the manageability of MSCS in three distinct categories:

1. Ease-of-use
2. Productivity
3. Event/Problem notification...

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Table of Contents

1. Introduction.
Clustering—a Means to an End. What Clustering Provides. Business Data—to Replicate or Not? Disk Sharing. MSCS-Based Solutions. What the User Sees. SAP R/3 Support for Microsoft Clustering. IBM Netfinity Clustering Solutions.

2. Introduction to High Availability.
High MTBF. Low MTTR. Windows 2000 Reliability Improvements.

3. SAP R/3 and High Availability.
SAP R/3 Architecture. SAP R/3 System Landscape. SAP R/3 Components. Using MSCS with SAP R/. Alternative Approaches to SAP R/3 High Availability. Microsoft Cluster Server and SAP R/. Backup and Recovery.

4. Hardware Configuration and MSCS Planning.
Checklist for SAP MSCS Installation. Certification and Validation of Hardware. Hardware Sizing. Disk Layouts. Typical SCSI RAID Controller Configurations. Fibre Channel Configurations. Network Configurations.

5. Installation and Verification.
General Overview of the Installation Process. Setting Up Security. Hardware Configuration and Installation. Windows NT Installation. MSCS Pre-Installation Testing. Basic Windows NT Tuning. Microsoft Cluster Server Installation. Service Pack and Post-SP Installation Steps. MSCS Verification. Create the Installation User Account. SAP and DBMS Installation. SAP Verification. DBMS Verification. Backbone Configuration. SAP Cluster Verification. Tuning. Configuring a Remote Shell. Configuration of the SAPOSCOL Destination.

6.Installation Using Oracle.
Preliminary Work. Oracle Installation. Installation of the R/3 Setup Tool on Node A. Installation of the R/3 Central Instance on Node A. Install the R3Setup Files for Cluster Conversion. SAP Cluster Conversion. Oracle Cluster Conversion. Completing the Migration to an MSCS.

7. Installation Using DB.
The SAP R/3 with DB2 UDB Cluster Configuration Explained. Preliminary Work. DB2 Installation. Install the R3Setup Tool on Node A. Install the Central Instance and Database Instance. DB2 Cluster Conversion. Install R3Setup Files for Cluster Conversion. SAP Cluster Conversion. Complete the Migration to MSCS.

8. Installation Using SQL Server.
Preliminary Work. Install SQL Server and SAP R/. Install the R/3 Setup Tool. Install the SAP R/3 Central Instance. Convert the Database to Cluster Operation. Install the Cluster Conversion Tool. SAP Cluster Conversion. Complete The MSCS Migration. Removal of Unused Resources.

9. Backbone Network.
Backbone Configuration. Benefits of the Backbone Configuration.

10. Tuning.
Advanced Windows NT Tuning. General SAP Tuning. Database Tuning.

11. Verifying the Installation.
How to Troubleshoot the System at the End of the Installation. Log Files. Services. Accounts and Users. R3Setup.

Appendix A: Special Notices.
Appendix B: Related Publications.
IBM Redbooks. IBM Redbooks Collections. Related Web Sites. Downloadable Documents. SAPSERV FTP Site. OSS Notes. Knowledge Base Articles. Other Publications.

How to Get IBM Redbooks.
List Of Abbreviations.
Index.
IBM Redbooks Evaluation.
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