[mrtg] rrdtool backend

Steve Shipway s.shipway at auckland.ac.nz
Wed Mar 19 05:17:00 CET 2008

Technically, MRTG only adds the point-in-time data to the RRD.  Then, RRDTool immediately updates the various RRAs (whatever they are) in accordance with the data sent.
So, however many new RRAs you add, they will get updated when MRTG sends the new data.  You may need to create your own code to actually report them, though.


From: mrtg-bounces at lists.oetiker.ch on behalf of R Dicaire
Sent: Tue 18-Mar-08 8:10 p.m.
To: mrtg at lists.oetiker.ch
Subject: Re: [mrtg] rrdtool backend

On Tue, Mar 18, 2008 at 1:12 AM, Steve Shipway <s.shipway at auckland.ac.nz> wrote:
> However, you can always use rrdtool to add extra RRAs to the .rrd files, and
> when MRTG updates the .rrd file then all RRAs will automatically be updated.
> So, by all means add some MIN RRAs for the various resolutions.  However, to
> report on them, you will need to make some custom reporting.  One
> interesting set of RRAs is the set for spotting unusual values that do not
> match historical patterns.

This is a good thing to know. If I alter an .rrd file to add MIN, will
mrtg add MIN-type data to that RRA?

aRDy Music and Rick Dicaire present:
http://www.ardynet.com <http://www.ardynet.com/> 

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