[mrtg] Re: Postfix Stats graphing wrong

[Alex van den Bogaerdt]

On Fri, Nov 14, 2003 at 12:05:05PM -0700, Jeff Gojkovich wrote:

> Which doesn't make sense to me.  I am not sure how MRTG handles the
> numbers it receives though.  I though the default was to take the
> difference of the new number and the last result.

and divide this by the difference in time.

> > I have a script that grabs the rejects from a postfix box.  It returns
> > results to MRTG like. 33479 33479 35 days  5:07 heffe.eaznet.com
> >
> > Then five minutes later.
> > 33609
> > 33609
> > 35 days  5:12
> > heffe.eaznet.com

(33609-33479)/(05:12 - 05:07) = 130/300 = 0.433333...

If "perminute" is used, the rate will be multiplied by 60 and become
130/5 = 26.0  (there are five minutes in 300 seconds)

Perhour will result in 130/0.833333... = 1560 (0.08333.. hours in 5 minutes)


If the rate seems to be constant, the input will be constant.  Focus on
that; for instance: let your script log the time and the values to a
separate logfile and do the calculations like I did above.

HTH
Alex

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