Why not have a script that checks a couple of items? You can check the total bytes of the interface transferred using ifconfig. A simple script will keep track of this. These counters are reset on reboot and will roll over. I don't know if they are still a 32 bit value or not. Roll over and reboot detection should be easy and this will give you an exact number, not a guess from rrdtool numbers. Simply have a cron job run every 15 minutes and add the number to a file or even a quick sqlite database. I would suggest the latter as you can easily sum, average and do all sorts of other types of reporting. <br>
<br>I am a bit biased against RRD because I have seen spikes in our ganglia reports that can't be accounted for. These spikes skew the data and are usually easily removed but it is a hassle I shouldn't have to go through. <br>
<br>Dan<br><br>