This was a very good overview of the many varied components and technologies that make up a storage area network. It goes into a lot of detail about things like standards, protocols, speeds, etc. If you want to understand the differences between iSCSI and FCIP, for example, this is the book for you. The word "Reference" in the subtitle is accurate. It's not a guide on how to administer a SAN day-to-day in the real-world; it's about the concepts and details of what a SAN really is. The writing style is a little dry, but I didn't expect it to be a page-turner. My only disappointment was when I realized that over 1/4 of the book is devoted to appendices, glossary and index instead of written content.