[mrtg] Re: Inconsistant graphs that seem to disagree with rrd data

[Jim Mozley]

Alex van den Bogaerdt wrote:

> On Mon, Jan 19, 2004 at 04:18:35PM +0000, Jim Mozley wrote:
> 
> 
>>            . No changes have been made to the configuration. The only 
>>think I can think that was different to the norm was that the interfaces 
>>were passing a constant volume of data, rather than the usual varying 
>>traffic.
> 
> 
> If you mean ___*really*___ constant, this usually is a sign that MRTG
> was unable to read the remote device _and_ that you have no "UnknAsZero"
> option set.
> 
> When monitoring resumes, the gap in time is filled with the rate at
> that time, resulting in a somewhat large amount of time having the
> same rate.
> 
> This does not explain any of the other problems you describe but I'd
> like to let you know anyway.
> 
> HTH
> Alex

Thanks Alex for pointing this out, but the reason it was constant (I 
should have said nearly constant) was because a traffic generator was 
being used at a constant output. I'm aware of the UnknAsZero option.

I guess the cause will remain unknown; the graph showed around 150 Mb/s 
during the network testing on the daily graphs (when it should have been 
around 115 Mb/s) and now shows correctly on the weekly graph at around 
115 Mb/s.

Thanks again,

Jim


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