[mrtg] Re: Weekly greater than daily. Why ?

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Mon Feb 7 23:34:52 MET 2000

Jacek Zabicki wrote:
> I monitor number of active connections on Cisco 3640 using withpeak option.
> The strange thing is that Max Weekly value is grater then Max Daily value,
> which obviously makes no sense. Weekly max is 7 and daily max is 6. Any
> explenations for this?
> Thanks in advance.

This is an hidden feature.  MRTG assumes you are monitoring on exact
five-minute intervals, at time xx:00, xx:05, xx:10 etcetera.
If you don't (and you won't! believe me) some interpolation of the
samples takes place.  This may cause a real value of 7 to be interpolated
to 6.9999999 (or lower) which is rounded down to 6.  Check the log file
to verify, compare the 2nd column to the 4th and the 3rd to the 5th.

The daily graph doesn't use the 4th and the 5th column, it just displays
the averages; not the maxima.

The weekly graph does use these peak values and therefore it will pick up
the value 7 from the 4th (or 5th) column.

 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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