[mrtg] Re: Setting Max Height

[Alex van den Bogaerdt]

Brian E. Seppanen wrote:

> Periodically we have a spike in traffic that is so sizeable that the
> remainder of the values don't show up on the graph scale.  The scale of
> the image becomes so unreasonable that we have a graph with 10M showing
> up twice a day and basically no other traffic showing.   How do I scale
> the image to ignore the peaks.  withpeak sounds vaguely like the option,
> but the description makes me question if it does what I think it should
> do.

First of all you need to make sure that you use the proper
maxbytes and absmax settings.  If you did, this means that
this spike is really happening on your network.  If not,
make sure to add/alter those settings.

When this peak is really occuring and you don't want to know
about it there are three options:
- hack rateup to not display anything above a certain level
- switch to rrdtool and write your own grapher script that
  ignores anything above a certain level (IIRC the tutorial
  contains an example on how to do this)
- change your maxbytes into something that you can live with,
  be prepared for wrong percentages in that case.

The first two cases don't alter the logged data, they just don't
display the peaks.  The third option does alter the data, it
will ignore valid traffic.

cheers,
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