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Preface - Pg. 9

Preface LVM: Logical Volume Manager. What is its role in the AIX operating System? How does it perform this function? Its role is to controls disk resources by mapping data between a more simple and flexible logical view of storage space and the actual physical disks How it performs this function is in a topic vast enough to fill two books. This first volume, AIX Logical Volume Manager, from A to Z: Introduction and Concepts describes the basic components and defines physical volumes, including volume groups and logical volumes. This book also describes the advanced functions of the Logical Volume Manager, such as the mirroring to increase the availability of the data, the stripping to spread data across several disks and increase the performance in accessing large amounts of sequential data, or the online backup function included in AIX Version 4.3.3. This book is aimed at every IT specialist who wants to know more about the core element of AIX, which is the Logical Volume Manager. The team that wrote this redbook This redbook was produced by a team of specialists from around the world working at the International Technical Support Organization, Austin Center. Laurent Vanel is an AIX and RS/6000 specialist at the International Technical Support Organization, Austin Center. Before joining the ITSO three years ago, Laurent Vanel was working in the French RISC System/6000 Technical Center in Paris where he was conducting benchmarks and presentations for the AIX and RS/6000 solutions. Ronald van der Knaap is a Senior I/T Specialist in the Netherlands. He has 11 years of experience in the Unix/AIX field. His areas of expertise include a wide range of System and Network Management products, AIX related products, HACMP, Performance & Tuning, and RS/6000 SP systems. He has written extensively on LVM Performance and journaled file systems. Dugald Foreman is an AIX support specialist in England. He has two years of experience in AIX, both spent working for IBM. His areas of expertise include problem determination in software development and the AIX base operating system. He has written extensively on LVM recovery procedures. Keigo Matsubara is an Advisory I/T Specialist in Japan. He has seven years of experience in the AIX filed. His areas of expertise include a wide range of © Copyright IBM Corp. 2000 9