Nagios

Nagios rocks as a network management system. In fact, at the company I contract for, they are phasing out HP in favour of Nagios, for a variety of reasons.

During deployment of a distributed Nagios environment, we ran into some pretty serious performance issues which we analysed and worked around. This is described in Reducing Load on a Distributed Nagios Installation and has been translated to German by Thomas: Lastreduzierung in verteilter Nagiosumgebung

Software used for Nagios Blinkenlights