[rrd-users] Optimize RRD update

Gwenael Lahay gwenael.lahay at wanadoo.fr
Mon Feb 4 11:13:24 CET 2008


To be more concrete, i use rrd files to store data extracted by the tool
The tool calculates the bits/sec and packets/sec on a network.
I store this result in rrd files (the tool calculate the average for 1

For the moment, i use this parameters :

step 60




Flowscan tool returns only values different to zero.
If there is no data, it means that there is no flow on the network (zero

do i use correct parameters ?

2008/2/4, Fabien Wernli <wernli at in2p3.fr>:
> On Sun, Feb 03, 2008 at 06:48:06PM +0100, Gwenael Lahay wrote:
> > I update my rrd file to put zero values because my rrd file stores 3
> > frequency of the same data.
> and only one of the 3 gets updated at any one time?
> > correctly the average value for 5 minutes and half and hour.
> > For example, i have the following value for a 5 minutes interval :
> > NaN 3 NaN NaN NaN NaN
> > The program store a NaN data for this 5 minutes interval.
> so what is Nan: the measure (rrdtool fetch output) or your calculation
> (rrdtool graph) or both?
> If you manually calculate the average between frequencies, you may wanna
> play with RPN IF expressions to check for nan values
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