[rrd-users] brief question on DS update frequency

Tobias Oetiker tobi at oetiker.ch
Thu Apr 22 14:43:20 CEST 2010

Hi Dave,

Today Dave Whitehead wrote:

> I have a RRD (step 300 secs) - and one RRA (12 PDP per row). It's a
> GAUGE (min 0, max 60000).
> If I update this DS *much* more often than 300 secs what effect will
> that have - eg maybe every 20-30 secs. Will RRD "sort it out"?


> Reason is that although I'm only wanting 5 min resolution on the DS -
> the data provider produces output every 20-30 seconds and *stopping* it
> doing that is tricky.

this is fine ... rrdtool will assume a stair-step curve where each
mesurement defines the value at the end (time whise) of a step. The
space below the curve gets integrated in the process and a new step
with the same space below get created for inclusion in the RRAs.


Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900

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