[rrd-users] Re: Calculating a 5%-rule

Geert van der Ploeg geert at triple-it.nl
Fri Feb 15 15:37:44 MET 2002

> > How to calculate what value is the highest, after ignoring the highest 5% ?
> Do not use it for production yet, but you may want to explore the
> beta releases of RRDtool.  95th percentile is already there.
> I'd be interested to know that it actually works and does the job you
> want it to do.

Ok, thanks all for replying.

 - It's not possible using only RRDtool (at this moment, stable versions)
 - Everybody in need for a percentile function is just doing some external things
 - In the code snapshot there's a working version of the PERCENT function

This PERCENT function indeed does the right job for me...
Moreover: it allows indeed to do a calculation over any vname (thus not limiting to raw datasources,
one at a time, as the external scripts do)

Too bad it is still in beta-status... :-(

Leaves the following questions:
 - When can we expect the first stable release including the VDEF statement (allowing PERCENT,
MAXIMUM, etc)?
 - Is it recommended to use the beta-release for calculating the percentile rule and the normal
release for the rest of the graph?


Geert van der Ploeg
Triple IT

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