I've been in the RAID business (OEM) for about 6 years, this book has some errors, and bad logic. It may be OK if you are in it as a hobbyist. In the sample chapter he talks about setting up a 480 MB/sec SCSI 160 raid card for a web server. For that application, a simple hardware raid card, would work better, and have lower CPU overhead. On the higher end, where is the talk of fibre channel, drivers and stability? I'd skip this book - look for Designing Storage Area Networks: A Practical Reference for Implementing Fibre Channel SANs, Blueprints for High Availability: Designing Resilient Distributed Systems, and read on the net.