[rrd-users] Re: alt-y-mrtg rrdgraph option problem?

[Kingsley Foreman]

I have aslo got this problem
Ive found what is happening is that it is putting the incorrect scale on
the side, The graph is correct but it the scale is adding 1 to its
multiplier

eg if the peak should be 48 then it is 4x12 but the scaledstep thinks it
should be 4x13

im think it is somewhere in the rrd_graph.c file but my c++ maths is no
where near
good enough to actually be able to fix it

Anyone else want to look at this problem


Kingsley



>
> ----- Original Message -----
>
>
> I am also having this problem
> I think a good solution would be to add an option like
> --y-split 4
> eg. it spilts they y axis into 4 sections or something like this
>
>
>
>
>
> > On Tuesday 17 December 2002 15:11, Fernando Nieto wrote:
> > > Hi everyone,
> > >
> > > Here I'm sending three graphs, all of them are from the
> > > same data file.
> > >
> > > 1) sample-mrtg is the daily graph generated from mrtg's
> > >    rateup
> > > 2) sample-alt-y-grid is the same graph generated from the
> > >    rrd file with rrdgraph and setting the option
> > >    --alt-y-grid
> > > 3) sample-alt-y-mrtg is generated with rrdgraph from the
> > >    rrd file with the option --alt-y-mrtg
> > >
> > > As you can see, graphs 1 and 2 show the same values, but not
> > > graph 3, where for example at 12:00 Out traffic is ~2G and
> > > not ~1.6G.
> > >
> >
> > I do not agree, data displayed are the same :), but there is bug in
> > rounding/scaling data to fit the max allowed graph heigth. So data
> displayed
> > are correct, as you can see from labels below graph - minima and maxima
> are
> > the same, y label is incorrectly computed. But yes, from outer
perspective
> > it
> > looks as bad data.
> >
> > > Values represented with --alt-y-mrtg seems to be more than
> > > 25% higher than the true data stored.
> > >
> > > Does anyone know if this behaviour is normal or it's perhaps
> > > a bug for --alt-y-mrtg option?
> > >
> > Well, this is certainly not normal and should be fixed. Initially I
wrote
> it
> > as a quick hack to be able to generate mrtg-like graphs, so my web pages
> > would look more uniformly even with mixture of mrtg-generated and
> rrd-based
> > graph, but I was not that succesfull implementing it. Unfortunatelly, I
> have
> > only near to no time now to deal with this issue, just if you would
like,
> we
> > could discuss it a bit more, maybe some solution could be found.
> > Milan

> >
>

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