[rrd-users] Re: lost data on graph

[Stephan Harren]

OK, now I think I know your problem.

You were using the AVERAGE-consolidation when creating. So far so good. But 
when you use thousands of values and only use 400 pixels of width, all the 
values are consolidated to some (by averaging because it's an AVERAGE) and 
from this the MAX is CDEFed, so you're going to lose your peaks. You cannot 
force rrdtool to use step=1, just because it wouldn't fit into the graph.

As I saw, you changed behaviour in the scripts that you sent to me. There you 
use the MAX consolidation so you won't lose peaks.

Is that understandable? If not, please get back to me.

HTH,

Stephan

> > After creating a graph with:
> > +++++++++++++++
> > rrdtool graph graph_name \
> > DEF:forms_processtime=forms_processtime.rrd:forms_processtime:AVERAGE
> > LINE1:forms_processtime#FF0000 \
> > GPRINT:forms_processtime:MAX:"%lf" \
> > -s $start_time_in_sec_6am -e $cur_time_in_sec \
> > --no-minor -a PNG -w 400 -h 300 \
> > -t "*Forms Run Time Performance Data for "$cur_server
> > +++++++++++++++
> >
> > I saw the MAX value display is 0.096.
> > I know that I have other values that are higher than 0.096, ie 0.226,
> > 0.119, etc..., which I confirm with the fetch function:
> > +++++++++++++++
> > rrdtool fetch forms_processtime.rrd AVERAGE -r 1 -s 1068922800 -e
> > 1069392186
> >
> > | grep -v nan | grep -F "e-01"
> >
> > 1068955200: 2.2631333333e-01
> > 1068963000: 1.1908000000e-01
> > 1068991200: 1.3447333333e-01
> > 1069020300: 1.1738000000e-01
> > 1069033200: 1.2168666667e-01
> > 1069058100: 1.1092000000e-01
> > 1069071600: 1.4121333333e-01
> > 1069107300: 2.0028000000e-01
> > 1069111800: 2.4645333333e-01
> > 1069331100: 1.1736000000e-01
> > 1069348200: 1.4749333333e-01
> > +++++++++++++++
> >
> > So, why is the graph not showing 0.236 and 0.119?
>

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