Some problems are pretty evident. If the hard disk your server boots from is broken, it won't boot anymore. You'll notice that immediately. Other problems, however, are less obvious. If a user complains about your server being unreachable but you look at the console and your server still seems pretty reachable, you need to do some analysis to find out what's wrong. Although it is impossible to provide a complete list of everything you can do (such a list would be dependent on hardware and would be outdated by the time this book is in print), in the next sections you will read about the most important solutions you can use to find out what's wrong.
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