I tried the CDEF to see if this would generate the graph that I initially expected and (of course) it does. As you suggested the total value is still calculated with VDEF.
It would be nice if I could draw vertical lines after each interval from height=rate/value to the x-axis. That way the graph would look more like a histogram which might help making the correct interpretation more easy. I looked at VRULE, but that's not going to help here as far as I can tell. I already established for myself that the calculated total value matches with what the meter shows at different times. So I am pretty sure everything is ok now. Everytime I checked, the last stored value (as seen in rrdinfo output) also matches with the meter value, so rrdtool is working with the correct values and everything that I think comes out wrong is all just me ;) To be 100% sure I will do some write-downs of the meter value and create some graphs with the same intervals as the write-downs. Things (the total value) should match then. The gas meter itself updates in real-time, however the smart meter (from which I get the data) only 'asks' the gas meter once every hour for the counter value at that time. This can't be influenced, so as far as I can tell a step size smaller than 3600 doesn't make sense in this case. Because the smart meter also gives me power data and does so every 10 seconds, I actually read (and store) the gas counter value and power values also at a 10 second interval. Therefor I decided to use the LAST CF for the gas counter. The MAX CF would probably have the same effect since the counter is only going up. _______________________________________________ rrd-users mailing list rrd-users@.oetiker https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users -- View this message in context: http://rrd-mailinglists.937164.n2.nabble.com/Confusion-about-VDEF-total-and-graph-values-tp7583425p7583431.html Sent from the RRDtool Users Mailinglist mailing list archive at Nabble.com. _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
