Tntteam wrote: >I have a strange behavior on my graphs. > > >Here is the data source I use to generate the graph : > >http://img11.imageshack.us/i/image001ki.png/ > >As you see I inserted manually a 10 value to generate a high point >in the graph. > >The timestamp 1299062660 is 11:44:20 (GMT +1) > > >Now is the output rrd graph : > >http://img534.imageshack.us/i/image002pjf.jpg/ > >And my rrd definition : > > >rrdtool info 1.rrd : >filename = "1.rrd" >rrd_version = "0003" >step = 60
In RRD databases, ALL intervals are based on Unix epoch (midnight 1st Jan 1970 UTC). So your steps all end on the minute - not at 20s past the minute. SO your burst to a higher value is normalised so that 40s worth goes into the period ending at 11:44, and the other 20s worth goes into the next step. So your graph is quite correct. For more detailed explanation, see Alex's tutorials at : http://www.vandenbogaerdt.nl/rrdtool/ in particular the one on normalisation and consolidation. BTW - full marks for providing the exact data used for the test, the definition of your file, the actual output, and a description of what you expected. Most people omit 2 or 3 of those items ! -- 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 [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
