[rrd-users] False positives with aberrant behavior detection

Dave Plonka plonka at doit.wisc.edu
Wed Aug 18 18:48:45 CEST 2010

On Wed, Aug 18, 2010 at 05:57:58PM +0200, Tobias Oetiker wrote:
> Hi Dave,
> > It does seem that the current implementation differs from what I
> > was using in rrdtool c. 2002.  My recollection was that there was
> > the ability to widen the confidence band by a parameter and also to
> > have different settings for the upper vs. lower bound offset from
> > the forecast value.
> >
> > BTW, there is another implementation described here:
> >    http://www-iepm.slac.stanford.edu/monitoring/forecast/hw.html
> >
> the implementation has  not changed except that more features have
> been added ... note that some of the tunables are only accessible
> via rrdtool tune ... (one might consider that to be a non optimal
> situation).

Cool!  That's what I was forgetting.  Yes, the --delatneg, --deltapos,
and --failure-threshold are the attributes that I remember setting.

I think this will help Mike out.

Thanks Tobi.

plonka at cs.wisc.edu  http://net.doit.wisc.edu/~plonka/  Madison, WI

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