[mrtg] Re: Unscaled/MaxBytes/AbsMax

Peter Glanville peter_glanville at cuk.canon.co.uk
Fri Jan 2 10:08:34 MET 2004

>  I thought maybe if I set MaxBytes for 250000
> and AbsMax to 125000000 and then issuing the Unscaled command for the
> target, I'd get a graph that had a Y with no more than 200Kb/s visible,
> but MRTG would still accept larger numbers (which would represent a
> majority of the LAN traffic).

Almost correct. If there were no spikes, Y would be maxbytes.
When MRTG accepts higher values (up to AbsMax), it also plots them, and
will adjust the scale if needed.

> As it is, the occasional large spikes from file transfers between the
> server and local workstations, it causes all traffic where the web
> server is communicating with the T1 to pretty much be invisible on the
> graph.

Thats the problem with this technique

> Any suggestions?

Create two graphs.
One with a high absmax (or maxbytes), one with low maxbytes and no absmax.
The first will show everything including the spikes. The second will cut
the spikes off, and show you the low level in a readable manner.


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