[rrd-users] New with rrdtool - data is not plotting to graph
benjo11111 at gmail.com
Wed Sep 12 11:48:17 CEST 2012
Any feedback please.
> I am new with rrdtool. I am making a graph for our application which
> provides cumulative data. So for them analysis, I use derive DATA
> SOURCE TYPE. Derive DST means : always take difference from current
> value and last value.
> my rrd command :
> rrdtool create a.rrd \
> --step 60 \
> DS:A:COUNTER:120:0:U \
> rrd update command :
> logger rrdtool update a.rrd N:$A
> it shows each time value in syslog, so it is working fine.
> rrdtool graph a.png -a PNG \
> --title="Info" -w $Width -h $Height \
> --watermark "`date`" \
> 'DEF:A=a.rrd:A:MAX' \
> 'LINE:A#00dd00:A' > /dev/null
> it generates blank graph.
> Where i did mistake, please provide your feedback.
> One confusion from me : RRA stands for Round Robin Archive, so
> when we should use MAX/MIN/AVERAGE/LAST with RRA? Please provide some
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