> When I fetch the values I see this: > 1225359000: 3.8814344466e+03 -7.3078100609e-05 > 1225360800: 3.8815660814e+03 7.3156179499e-05 ... > Why do I get the decimals from time to time? It seems every time the > polled value changes I get a "soft" change over three samples.
Data time window normalisation. The RRD has 'buckets' at (eg) 5-min intervals. If your sample is logged EXACTLY on the boundary of the bucket, that's what you see. Otherwise, it draws a line from the last value to the new sample, and logs where it passes the boundary -- ie, normalises to the exact time point. This is in the RRDtool docco but it's a bit weird to understand - you need to remember that RRD was originally created for graphing network traffic data rates and then it makes sense. Steve _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
