Why is my Cacti graph empty and the figures read “nan”?
“nan” stands for “not a number” i.e. “no results”. If your VPS has only just been provisioned then this is completely normal – 3 readings are necessary to draw the initial graph, and as readings are done every 5 minutes the daily graph will remain empty for at least the first 15 minutes. The weekly, monthly and yearly graphs are built from the daily one and will stay empty until the daily graph has the required amount of data: 30 minutes, 2 hours and one day respectively. If your VPS has been in use for some time and the graphs are empty then there is possibly a problem; please contact support.
