[mrtg] Re: Large inaccurate spikes in graphs

Valdez, Timothy (AGR) TValdez at agr.wa.gov
Wed Sep 7 00:33:00 MEST 2005

heh heh - we get the same spikes. It's due to the nightly traffic to our
tape backup server! Possibly the same cause on your network also...


> -----Original Message-----
> From: mrtg-bounce at list.ee.ethz.ch 
> [mailto:mrtg-bounce at list.ee.ethz.ch] On Behalf Of Adam Bayless
> Sent: Tuesday, September 06, 2005 2:01 PM
> To: mrtg at list.ee.ethz.ch
> Subject: [mrtg] Large inaccurate spikes in graphs
> I'm using mrtg 2.12.2 on BSD/OS and getting very large spikes 
> in the graphs that can't possibly be accurate. I have AbsMax 
> set for all graphs, and the spikes are not going above 
> AbsMax, but they are still too big for the counters being 
> graphed. Is there a known bug for MRTG that might explain 
> this? We just started seeing this happen recently on several 
> different types of graphs (snmp target and external scripts). 
> The machine doing the graphs is fairly busy (load averages:  
> 9.38, 8.28,  8.04 ) but would this make MRTG start making 
> arithmetic mistakes?
> Here's an example graph:
> http://www.fiber.net/users/abayless/117458-day.gif
> Thanks,
> Adam

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