[rrd-developers] Re: LINE2 precision in rrdtool 1.1.x

[Tobias Oetiker]

Tuesday Stanislav Sinyagin wrote:

>
> Hello all,
>
> Sometimes LINE2 is drawn with a bigger step than it's
> defined in RRD, though the rrd_graph arguments are
> the same.
>
> See these examples:
>
> Correct graph (except that TICK doesn't work):
>    http://ipv6.multikabel.net/render-correct-1.bmp
>
> Weird graph:
>    http://ipv6.multikabel.net/render-fault-1.bmp
>
> These graphs are drawn with the same (quite standard)
> arguments, at different moments in time.
>
> Is it a bug or a feature?

well this is due to the automatic selection of the RRA which
supplies data it seems you have setup RRAs in your RRD which
provide data in such a way that the lower resolution rrd provides
better coverage of the requested time slot ... and coverage alywas
overrides precision....

eg 1 RRA is 3 steps and the other is 7 steps ... this will cause
a number of points in time where the 7 step RRA will provide better
converage of the requested interval than the 3 step RRA ...

cheers
tobi

the >
> Regards,
> Stan
>
>
>
>
>
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