Got it. Thanks for the clarification.
-Jon > On Jan 15, 2015, at 12:12 PM, Simon Hobson <li...@thehobsons.co.uk> wrote: > > Jon August <jonaug...@gmail.com> wrote: > >> I do an update like this: >> >> rrdtool updatev filename.rrd N:1102 >> >> What am I doing wrong? > > One update does not create a value in the database - it merely sets a "known > point", and for the very first update, all data up to that point is unknown. > You need to make repeated updates over a period of time. Once you pass the > *END* of a data point, then a value will be computed for the previous > interval - but only if enough data has been entered for the interval to have > a valid value, that's what the "fudge factor" (0.5 in your example) is for. > > So in your case, you need multiple updates, not more than 48 hours apart (or > the data becomes unknown again), and after the end of a day* you will get a > value if you have enough data to fill the previous 12 hours (0.5 x 1day) with > valid data. > > * Note that a day will start/end at midnight UTC. All intervals end at an > integer multiple of "step" after midnight Jan 1 1970 (unix epoch). > > _______________________________________________ > rrd-users mailing list > rrd-users@lists.oetiker.ch > https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
