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time wore on, other priorities came along and the money that should have gone to replicating data and sending backups off-site was spent other ways. Many of the organizations that needed to protect themselves have done little or nothing in the time since September 11, and that is a shame. If there is another attack, it will be a great deal more than a shame. Of course, technology has changed in the last 4 years. We felt we needed to add a chapter about some new and popular technology related to the field of availability. 8 is an overview of SANs, NAS, and storage virtualization. We also added 22, which is a look at some emerging technologies. Despite all of the changes in society, technology, and families, the basic principles of high availability that we discussed in the first edition have not changed. The mission statement that drove the first book still holds: You cannot achieve high availability by simply installing clustering software and walking away. The technologies that systems need to achieve high availability are not automatically included by system and operating system vendors. It s still difficult, complex, and costly. We have tried to take a more practical view of the costs and benefits of high availability in this edition, making our Availability Index model much more detailed and prominent. The technology chapters have been arranged in an order that maps to their positions on the Index; earlier chapters discuss more basic and less expensive examples of availability technology like backups and disk mirroring, while later chapters discuss more complex and expensive technologies that can deliver the highest levels of availability, such as replication and disaster recovery. As much as things have changed since the first edition, one note that we included in that Preface deserves repeating here: Some readers may begrudge the lack of simple, universal answers in this book. There are two reasons for this. One is that the issues that arise at each site, and for each computer system, are different. It is unreasonable to expect that what works for a 10,000employee global financial institution will also work for a 10-person law office. We offer the choices and allow the reader to determine which one will work best in his or her environment. The other reason is that after 15 years of working on, with, and occasionally for computers, I have learned that the most correct answer to most computing problems is a rather unfortunate, It depends. Writing a book such as this one is a huge task, and it is impossible to do it alone. I have been very fortunate to have had the help and support of a huge cast of terrific people. Once again, my eternal love and gratitude go to my wonderful wife Carol, who puts up with all of my ridiculous interests and hobbies (like writing books), our beautiful daughters Hannah and Madeline, and our delightful son Jonathan. Without them and their love and support, this book would simply not have been possible. Thanks, too, for your love and support to my parents, Roberta and David Marcus, and my in-laws, Gladys and Herb Laden, who still haven t given me that recipe.
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Thanks go out to many friends and colleagues at VERITAS who helped me out in various ways, both big and small, including Jason Bloomstein, Steven Cohen, John Colgrove, Roger Cummings, Roger Davis, Oleg Kiselev, Graham Moore, Roger Reich, Jim El Jefe Senicka, and Marty Ward. Thanks, too, to all of my friends and colleagues in the VERITAS offices in both New York City and Woodbridge, New Jersey, who have been incredibly supportive of my various projects over the last few years, with special thanks to Joseph Hand, Vito Vultaggio, Victor DeBellis, Rich Faille, my roomie Lowell Shulman, and our rookie of the year, Phil Carty. I must also thank the people whom I have worked for at VERITAS as I wrote my portion of the book: Richard Barker, Mark Bregman, Fred van den Bosch, Hans van Rietschote, and Paul Borrill for their help, support, and especially for all of those Fridays. My colleagues in the Cross Products Operations Groups at VERITAS have been a huge help, as well as good friends, especially Dr. Guy Bunker, Chris Chandler, Paul Massiglia, and Paula Skoe. More thank-yous go out to so many others who I have worked and written with over the last few years, including Greg Schulz, Greg Schuweiler, Mindy Anderson, Evan Marks, and Chuck Yerkes. Special thanks go, once again, to Pat Gambaro and Steve Bass at the New York Board of Trade, for their incredible generosity and assistance as I put their story together, and for letting me go back to them again and again for revisions and additional information. They have been absolutely wonderful to me, and the pride that they have in their accomplishments is most justified. Plus, they know some great restaurants in Queens. Mark Fitzpatrick has been a wonderful friend and supporter for many years. It was Mark who helped bring me into VERITAS back in 1996, after reading an article I wrote on high availability, and who served as my primary technical reviewer and personal batting coach for this second edition. Thank you so much, Marky-Mark. Last, but certainly not least, I must recognize my coauthor. Hal has been a colleague and a good friend ever since our paths happened to cross at Sun too many years ago. I said it in the first edition, and it s truer now than ever: This book would still just be an idea without Hal; he helped me turn just-anotherone-of-my-blue-sky-ideas-that ll-never-happen into a real book, and for that he has my eternal respect and gratitude.
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