[rrd-users] Re: rrdtool fetch with computed resolution

[Tobias Oetiker]

Hi Sven,

rrdtool fetch will use the data which

a) covers the timerange you requested
b) has a higher or equal resolution to what you requested ...

cheers
tobi
Today Sven Ubik wrote:

> > Note that if you configure rrd to keep lots of hires values AS WELL
> > AS lower res values for the SAME TIME PERIODE, then there will be
> > no performance impact, only a huge disk space requirement.
>
> If I keep averages say over 10 and 30 seconds:
>
> RRA:AVERAGE:0.5:10:360
> RRA:AVERAGE:0.5:30:240
>
> and request averages over 60 seconds:
>
> rrdtool fetch file.rrd AVERAGE -r 60 ...
>
> Will rrdtool use 10 second or 30 second samples to compute 60 second
> samples?
>
> What if requested resolution is not a multiple of stored resolutions?
>
> I am asking in order to determine how much samples of each resolution
> should I store to cover the whole period in which I want to have some
> lowres average computable.
>
> Regards,
>
> Sven
>
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-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
http://tobi.oetiker.ch tobi at oetiker.ch ++41 62 213 9907

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