RRD to gnuplotAt work we collect monitoring data and store them in rrd format. To plot them one can use rrdtool. However, as we plan to write a paper with data coming from different sources it was decided to use gnuplot.
I use a perl script that you can download directly here. It is an adaptation of a script designed to convert RRD data to CSV. The original script is available here.
usage: rrd2csv [args] some.rrd
-a autoscale DS values (also --autoscale)
-c num convert DS values by "num" (also --conversion)
-e end report ending at time "end" (also --end)
-l label label DS values with "label" (also --label)
-m only report the maximum value (also --max)
-n only report values around now (--now)
-s start report starting at time "start" (also --start)
-v print the start and end times (also --verbose)
./rrd2gnuplot.pl -s 1 input.rrd > output.dat
The important thing is the time format:
set xdata time
set timefmt "%m/%d/%Y-%H:%M:%S"
plot 'output.dat' using 1:2