[rrd-users] max / min values not precise? Bug?

spock collector at sappers.de
Sat Aug 23 22:56:49 CEST 2014

Hi Simon,

> Because the line is not showing all the data. 

I think the lines shows all the data.

The timescale is 1 month (July 2014 = 31 days =  2976 data points). 
I tried to increase the x- resolution to 3000 pixel, but that did not change
the graph. I was hoping, that - according to your statement - rrdtool does
not have to average a few pixels to one data point, if the resolution is
high enough.

The red area in my example graph is exactly what you are asking for - but
the blue line with the detailed data (roof) does not touch the upper limits
of the red area (roof24harea).

CDEF:roof24harea=roof24hmax,roof24hmin,- \ 

LINE2:roof#0000FF:"Dach norm" \
        LINE2:roof24hmin#FF0000:"Dachmin" \
        AREA:roof24harea#FF000020::STACK \

I think, that the 
 DEF:roof24hmax=temp_pool.rrd:roof:MAX:step=86400 \ 
get a max value of about 59 ´, whereas the 
LINE2:roof#0000FF:"Dach norm" \
does not show any data above 51 for the same day ("Mi").

The lower limits (MIN) seem to be ok though.


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