Slicing the AS/400 with Logical Partitioning: A How to Guide

An IBM Redbooks publication


Take a tour of logical partitioning on the AS/400! Logical partitioning allows one physical system to be divided into multiple logical partitions, each endowed with its own resources and capable of running independently. This IBM Redbooks publication discusses the logical partitioning revolution on the AS/400 system. It is designed for all levels of understanding. It targets the person who simply needs an overall view of logical partitioning on the AS/400 system. And, it targets the technical people who will be actively engaged in devising solutions that involve logical partitioning, creating partitioned machines, and managing and operating them.

A shift to a more consolidated view of computer systems has triggered a renewed increase in machine sizes capable of consolidating multiple environments. The AS/400 system has embraced this trend by increasing its size and implementing logical partitioning, the concept of independent logical machines within large physical machines. This book is about the logical partitioning revolution on the AS/400 system. It is a new weapon in the AS/400 system's already rich armory.

Logical partitioning dates back to 1976, when IBM experimented with the S/370. Other hardware manufacturers followed this IBM path with various flavors of the concept. By 1997, companies such as Amdahl, Hitachi, and SUN, along with IBM, had their own versions of system partitioning. In 1999, the AS/400 system burst onto the scene with its own implementation.

Here is a brief guide to the chapters of this book:
- Chapter 1 explains the basic concepts of logical partitioning and provides several scenarios where this new functionality can be beneficial.
- Chapter 2 offers practical information for the reader who needs to plan and implement a logical planning solution. This chapter has numerous references to other existing publications for finer detail as required.
- Chapter 3 considers the aftermath of logical partitioning and addresses itself mainly to the day-to-day routine of working with logical partitioning.
- Chapters 4 and 5 extend Chapter 3 and deal with change management and problem management in the context of logical partitioning.
- Chapter 6 discusses capacity planning and performance. It provides valuable insight in the task of initially assessing the suitability of implementing logical partitioning in a given situation, developing the logical partitioning configuration to fit the situation, and ensuring the continued optimal performance of the installation.
- Chapter 7 explains the crucial topic of high-speed communication between logical partitions. This is one of the many remarkable features of logical partitioning.
- The book contains appendices and references to other publications.

This material is also beneficial to IBM customers, IBM Business Partners, and IBM technical staff. Regardless of your level of expertise, this book tells you all you need to know about logical partitioning on the AS/400 system.

Table of contents

Chapter 1. Logical Partitioning Concepts
Chapter 2. Planning Considerations
Chapter 3. Operational Considerations
Chapter 4. Change Management for a Logical Partition
Chapter 5. Problem Management for a Logical Partition
Chapter 6. Capacity Planning and Performance
Chapter 7. Inter-Partition Communication
Appendix A. Logical Partitioning Terminology
Appendix B. Sample RPG and C Programs
Appendix C. Accessing LPAR Functions
Appendix D. Operations Console Connection for Partitioned AS/400
Appendix E. Interactive and Batch CPW Determination


Publish Date
18 August 1999

Last Update
31 January 2001

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