Thanks Simon. I'm not yet very familiar with rrdtool, but could I read out data values for an arbitrary period between time1 and time2 and add up the values to come up with accumulated?
I was thinking of a page where I could choose the dates and then have a graph drawn for those dates, including the accumulated values as well. >I would like to also display an accumulated counter (say total >bandwidth for the month), how would I do that on the graph and on >the rrd table? By calendar month, or by period ? I've just added that to some of my graphs. While the script if parsing options and setting variables (specifically end and start times), I also set a variable for the accumulator period* I have separate CDEFs etc that will get the average for that period, multiply by the accumulator period (eg 86400 for 24 hours), and then display the result.
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