2011 LinuxQuestions.org Members Choice AwardsThis forum is for the 2011 LinuxQuestions.org Members Choice Awards.
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nagios is a very powerful monitoring tool- you can easily (almost always) monitor everything you want to, from linux to windows servers, routers,etc. and it is for free! I have tested another tool before- an expensive one and not so flexible like nagios.
We switched from Nagios to Shinken and our performance issues went away (monitoring a lot of stuff on mediocre hardware). The features they are adding to Shinken shows a real solid roadmap that maps to what and how you would want to monitor as a business.