Would Nagios be a good tool to use for monitoring 800+ linux machines? Is it possible to setup Nagios to send an email alert right at the time a machine goes down? Is it possible to setup Nagios to alert when disk space reaches a certain threshold?
For when a machine crashes, can you have Nagios make a list of which machines are down and report it every 5 minutes?
Nagios seems like a pretty strong tool. Thanks for your time!