Simon; Something is seriously wrong and I don't know what it is.
My Perl script parses the data file just fine. It plots just fine. The legends are correct The dates are correct. BUT when I use rrdtool first <rrd database> in an attempt to get the time of the first entry, I get a Unix time stamp which is one entire month EARLIER than the first entry in the file. And each time I do update, rrdtool first <rrd_database> returns a DIFFERENT number. The rrd database is created with an RRA sufficient to contain an entire month with readings taking every 15 minutes (900 seconds). I would appreciate any suggestions. Deepest Regards Steven Sim On Tue, Jul 1, 2014 at 8:23 PM, Simon Hobson <li...@thehobsons.co.uk> wrote: > Steven Sim <unixan...@outlook.com> wrote: > > > my rrdtool first <rrdfile> command keeps returning different timing > after each rrdtool update. > > > > Why is that so? > > > > Shouldn't it ALWAYS return the Unix time stamp for the first entry? > > It's not a function I've used ... > > The docs say it should return the first value entered. Once you've > "filled" a data set, then it's going to give you the timestamp of the > oldest available value - I'm not sure what it gives you for an RRD file > that hasn't been "filled". > Here I'm using the term "filled" to mean you done enough updates that the > whose database (or at least data series) has been filled with data and you > are now losing older data to make way for the new data. > > Have you looked at how the value is changing ? Does it by any chance > advance at the same rate as the timestamp of your updates ? > > _______________________________________________ > rrd-users mailing list > rrd-users@lists.oetiker.ch > https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users > >
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