[rrd-users] Help with creating an rrd-db
rrd-tool1 at de-brouwerij.be
Mon Jul 20 16:40:38 CEST 2009
I'm having troubles creating an rrd-db. I hope someone can point me in
the right direction.
I have a photovoltaic system I'm monitoring. At the moment I can make
nice graphs of the instantanious production, this means the power the
station is generating at a given moment. I poll the station about every
Another value is the total produced energy. This is where my problem is.
I created this rrd :
rrdtool create etot.rrd --start 1206187000 --step 15 \
What I would like to get is graphs of the energy-production per day, so
the value "last measurement of the day" - "first measurement of the
day", displayed per week, month, year.
When I enter the values (also at 15 seconds interval), I get unexpected
results in the graph. I get results mostly is the milli-range, while all
the values I enter are by now 4.5 million (Wh produced).
What am I missing here ? When I dump the rrd, I also get values in the
milli-range. Could it be that the values in the rrd are the difference
between the input values ? The values that are entered don't change much
in 15 seconds, many times, the difference is zero.
How can I solve this ?
Thanks for any pointers.
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