Munin

Munin represents the performance of the computer, SANs, networks, weather measurements, applications in graphical form. It is used to know about the resource allocation and its efficient usage. It works on the principle of client - server architecture. The master connects to all the nodes at particular interval and monitors all the data’s and stores them as RRD files.  It then displays the RRD files in graphical notation. The graph displays load average, CPU usage, memory usage, etho, traffic, MySQL throughput etc. It also helps to monitor two or more servers at the same time.