[mrtg] Re: There is any way of trimming peaks?

[Koelstra, J. (Jan)]

One alternative is 2 graphs of the same instance: One with the normal
traffic, and the other with the trimmed Maxbytes. If you want to have a
look at the total traffic use the first graph, if you want to know how
the daytime traffic looks then use the second graph.

Jan.

-----Original Message-----
From: Matt Walkowiak [mailto:matt at inetdvd.com] 
Sent: Monday, October 21, 2002 5:29 PM
To: Greg.Volk at edwardjones.com; mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: There is any way of trimming peaks?



> }We are trying to use mrtg to watch the internal traffic. The normal 
> }traffic is pretty low, below 64 Kbps in the 5 min average, but we 
> also }have some very high peaks (notably an automatic backup at 4 
> a.m.), }resulting that the daily graph looks flat for most of the 
> time.

> daily graph, then a bad way to get rid of the peaks would be to set 
> your MaxBytes value to an artifically low number. For instance, if 
> your backup peaks are 5Mbytes/sec and your regular traffic is IMHO 
> this is bad because it greatly reduces the accuracy (and therefore the

> usefulness) of all the graphs.

Ok, that makes a lot of sense, but what is the alternitive?  MRTG
certainly will not discriminate between "good" traffic and "bad"
traffic.  The only solution I can think of would be to always subtract
the bandwidth from the backup server:

Target[asdf]: goodIF - badIF

When the backup server is idle, goodIF = normal, badIF = 0.  When the
backup server is running, goodIF = normal + badIF, badIF = 5M/Sec, so in
theory, the final result would always be "normal".  I can think of a LOT
of loopholes in here, too.

Matt Walkowiak

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