As always, the more you know about your server, the better. That is one mantra valid all throughout the Web-Hosting business. Once you have this clear, you will understand why we have so many monitoring tools, excelling in their own way. The better they give you information about your server, the better they are. As each monitoring tool gives information as they see important, depending on more than one single tool to monitor your server is not at all a bad idea. On the other hand, the closer you keep track of your server; that too from various angles, will put you in a much better off position. Now lets check what are the situations when you need to be notified.