Jared Watkins wrote: >Ah.. now I think I get it. Put another way... the individual circuit >maxes aren't occurring at the same moment so you can't simply add those >max values up and expect to get the total from the stacked values.
Correct. >This >is because (in our case) the circuits are never going to be perfectly >balanced in traffic volume. This also means the delta between the two >values is a way of representing the amount of imbalance at the time of >peak traffic. I don't suppose there would be a way to calculate that >value? You would have to do it at data collection time, though I appreciate it might be difficult. You can do with averaged values, but that may not give you what you want since the more you consolidate the data, the smoother it tends to get. My coarsest graphs show one pixel per day over a year, so the daily variation in traffic flows completely disappears.Where it makes sense, I have an option to show/hide a max line - and the more the data is consolidated, the more pronounced the difference between average and max. So sticking with just two sources, you would have to modify your script to collect A and B, and store A+B and a measure of imbalance - perhaps |(A-B)|/(A+B) which would give the imbalance as a fraction of the total traffic (min 0 if A=B, max 1 when A=0 or B=0). You can then consolidate A, B, sum, imbalance, using both average and max consolidations. You should then be able to graph a stack of A and B, plus a line for max(sum), and lines for max(imbalance) and average(imbalance) which I suspect is what you are looking for. Obviously calculating imbalance gets harder as you add more data sources. -- Simon Hobson Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed author Gladys Hobson. Novels - poetry - short stories - ideal as Christmas stocking fillers. Some available as e-books. _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
