If you have problems with graph in your Cacti first what you should do is enable debug mode in Cacti. To enable debug mode: Go to "Graph Management" Open any graph (Localhost - Load Average) Press "Turn On Graph Debug Mode." Now you should see something like this: RRDTool Command: /usr/bin/rrdtool graph - \ --imgformat=PNG \ --start=-86400 \ --end=-300 \ --title='Localhost - Load Average' \ --rigid \ --base=1000 \ --height=120 \ --width=500 \ --alt-autoscale-max \ --lower-limit=0 \ --u...