[rrd-users] Help with creating an rrd-db

Yashodhan deshpande yashodhan at infineta.com
Mon Jul 20 19:31:11 CEST 2009

Hi Koenraad,
     The DS that you have chosen is COUNTER, which essentially means that it 
is supposed to be an ever increasing number and RRD would store the rate per 
second in the database. You mentioned that the values hardly change between 
two updates, that would explain the small values getting logged in the DB. 
Try using GAUGE instead as the typr of the DS.


----- Original Message ----- 
From: "Koenraad Lelong" <rrd-tool1 at de-brouwerij.be>
To: <rrd-users at lists.oetiker.ch>
Sent: Monday, July 20, 2009 7:40 AM
Subject: [rrd-users] Help with creating an rrd-db

> Hi,
> 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
> 15 seconds.
> 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 \
> DS:ETOT:COUNTER:30:0:10000000 \
> RRA:MAX:0.5:1:5760 \
> RRA:MAX:0.5:5760:7 \
> RRA:MAX:0.5:5760:31 \
> RRA:MAX:0.5:5760:366
> 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.
> Regards,
> Koenraad Lelong.
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