Comment Cacti & RRDTool (Score 1) 319
I have Cacti polling the byte counters on my Linux router interfaces, which then puts all that into an RRD file. I can then see usage by graph definitions created in Cacti.
But one very useful feature of Cacti is the '|sum:auto:current:2:auto|' feature (google this for further info), which does exactly what it says. Add this into any graph definition, and it will sum the entire data set values across the time frame that has been specified for the graph (obtained from the RRD file) and print you the sum of the values.
In other words, I can take my mouse, select the last 30 minutes of my bandwidth graph within Cacti, and it will tell me how much bandwidth I have used within this 30 minutes. Similarly, I can also select the last 30 days, and see my usage for the last month. In short, I can select -any- time period I want from my graph, and it will tell me how much data I have downloaded/uploaded during the selected time period. Very useful feature indeed (and one I don't think many know about).
But one very useful feature of Cacti is the '|sum:auto:current:2:auto|' feature (google this for further info), which does exactly what it says. Add this into any graph definition, and it will sum the entire data set values across the time frame that has been specified for the graph (obtained from the RRD file) and print you the sum of the values.
In other words, I can take my mouse, select the last 30 minutes of my bandwidth graph within Cacti, and it will tell me how much bandwidth I have used within this 30 minutes. Similarly, I can also select the last 30 days, and see my usage for the last month. In short, I can select -any- time period I want from my graph, and it will tell me how much data I have downloaded/uploaded during the selected time period. Very useful feature indeed (and one I don't think many know about).
