[mrtg-developers] Re: How many Routers we can poll using MRTG

Tobias Oetiker oetiker at ee.ethz.ch
Fri Sep 29 10:30:26 MEST 2000

Today you sent me mail regarding [mrtg-developers] Re: How many Routers we...:

BN> Jaji Hegde wrote:
BN> > 1. How many routers we can poll with polling frequency of 5 minutes.
BN> > Roughly, if you have done any experiment that would be great. Lets
BN> > assume on average 3 interface for each device.
BN> I estimate we could do at least 3000 targets with MRTG 2.9pre26 and
BN> rrdtool on an Ultra 2. That's 1000 routers /w three interfaces each.
BN> > 2. If the polling doesn't finish by 5 minutes, when cron tries to start
BN> > the second mrtg what happens.
BN> The new job will die and the old one will finish. With rateup, this
BN> wasn't a big problem, but with rrdtool the graphs gets really ugly.

*  can you elaborate on the 'ugly' bit ?
*  you may want to use the daemon mode then the mrtg will run
   continuously if it does not finish withing the interval

BN> > 3. How CPU intensive is mrtg.
BN> Not very; lots of time is spendt on I/O. But you would want to fork
BN> a lot.
BN> > 4. How can we scale it to poll more routers in the given polling
BN> > frequency.
BN> Add more iron?

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