[rrd-users] rrdtool graph don't show values

Didier Benza Didier.Benza at sophia.inria.fr
Wed Mar 16 08:59:46 MET 2005

I am new to rrdtool and I tried to create, update and graph a database 
as an exercice. I created a database to store RX and TX values resulting 
of the netstat --interface=xxx command on a linux box.

The command I used to create the database was :

rrdtool create netstat.rrd \
        --step 300 \
        DS:rx:COUNTER:400:0:U \
        DS:tx:COUNTER:400:0:U \
        RRA:AVERAGE:0.5:1:2304 \
        RRA:AVERAGE:0.5:6:2160 \
        RRA:AVERAGE:0.5:24:6480 \
        RRA:MIN:0.5:6:2160 \
        RRA:MIN:0.5:24:6480 \
        RRA:MAX:0.5:6:2160 \

The idea was to keep average data points for 5 minutes (8 days), for 30 
minutes (45 days) and for 2 hours (540 days). I did'nt want to keep min 
and max values for 5 minutes. I also wrote the following very simple 
script :

while (1)
        set ligne = (`netstat --interface=eth0 |& grep ^eth0`)
        set Rx = $ligne[4]
        set Tx = $ligne[8]
        rrdtool update netstat.rrd N:"$Rx":"$Tx"
        sleep 300

which updates the database every 5 minutes.

Everything works fine, the script is active since yesterday and I can 
see with rrdtool fetch or rrdtool dump that the data in the database as 
correct values (as far as I can tell) and time stamps. 

But I don't understand why using this command to generate a picture to 
see the evolution for the last 2 hours :

rrdtool graph netstat.png \
        -s -7200 \
        -w 1024 \
        -h 800 \
        -a PNG \
        "DEF:TX=netstat.rrd:tx:AVERAGE" \
        "DEF:RX=netstat.rrd:rx:AVERAGE" \
        "LINE3:TX:#FF0000:Transmit" \

I obtain a flat graph. the axis seems correct, the Y-axis is labeled up 
to 5.0K and the maximum MAX value recorded is 4.2840601064e+03, so it is 
fine. But there is nothing else than the grid and the labeled axis, no 

What is my mistake ?

Didier Benza                            Didier.Benza at sophia.inria.fr
Tel : +33 492 38 7167 /  Fax : +33 492 38 7602 
INRIA 2004, Route des Lucioles, BP  93, 06902 Sophia Antipolis Cedex

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