[mrtg] Re: Making MRTG graph negative numbers (workarounds?)

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Wed Oct 31 10:02:47 MET 2001

Bill Wichers wrote:

> I know MRTG can't nativly graph negative numbers, but I'm hoping maybe
> someone has a nice workaround. Basically I'm trying to graph temperature
> data which is slowly working it's way down the road to negative numbers in
> the north (:-() and I'd like to be able to record that in the graphs.
> My other question is does anyone know of a way to make MRTG keep track of
> the *minimum* values in the graphs? I'm looking for a way to do what it
> does for the current Max IN/Max OUT values, but to report minimums instead.
> It goes along with the temperature graphing I mention above.

Both are limitations in MRTG.  Both are overcome in RRDtool.

My suggestion to you is to download and compile RRDtool (to be found at
http://ee-staff.ethz.ch/~oetiker/webtools/rrdtool/ ) and read my

You can use RRDtool as a back end to MRTG however in that case you
won't solve your problem.  When you try another front end, or when
you write your own (believe me, this isn't hard to do!) you will get
the desired reports.

When you decide to do the data collection and graphing using a script
it isn't MRTG anymore; therefore you need to subscribe and use the
rrdtool-users mailing list for any questions you might have.  Before
you write to that list make sure to have read the tutorial.

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