[rrd-users] Issue: only the first value gets into the database

Steve Shipway s.shipway at auckland.ac.nz
Sun Aug 10 01:44:53 CEST 2014

Data Normalisation.  You have not collected enough data yet.

You are submitting your data with 'N' for 'Now' as the time point; however, RRDTool stores in regular Interval steps.  Assuming your interval is 5min, then you need to cover the whole 5min before the cdp (consolidated data point) in the RRA can be written, which means that you will usually need to least 2 updates before it starts to write.  After that, you should get one data point every update.

If your DS type is not Gauge, then you definitely need 2 data points in order to work out the slope.

If you have an Interval of X seconds and a heartbeat of H, and your smallest RRA has a Consolidation step size of S, then continue to submit data points at approximately X seconds intervals but not more than H seconds for at least X(S+1) seconds, and you should see data points start to appear in the RRA.


Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
s.shipway at auckland.ac.nz
Ph: +64 9 373 7599 ext 86487

From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] on behalf of spookyx [paul at infocon.ro]
Sent: Saturday, 9 August 2014 11:40 p.m.
To: rrd-users at lists.oetiker.ch
Subject: [rrd-users] Issue: only the first value gets into the database

Hello all,

I am having an issue with rrd... i am still a newby with it, but trying to
figure out what I am doing wrong.

I have database with 9 DS:
        DS:Cluj-Napoca:GAUGE:360:0:1000 \
        DS:Timisoara:GAUGE:360:0:1000 \
        DS:Iasi:GAUGE:360:0:1000 \
        DS:Constanta:GAUGE:360:0:1000 \
        DS:Craiova:GAUGE:360:0:1000 \
        DS:Brasov:GAUGE:360:0:1000 \
        DS:Galati:GAUGE:360:0:1000 \
        DS:Ploiesti:GAUGE:360:0:1000 \
        DS:Oradea:GAUGE:360:0:1000 \

And the update command is:
rrdtool update wazers_ro.rrd

However only the first value gets update. If I do a dump on the file this is
what I get:
                         <row><v> 2.1000000000e+01 </v><v> NaN </v><v> NaN
</v><v> NaN </v><v> NaN </v><v> NaN </v><v> NaN </v><v> NaN </v><v> NaN

So, why aren't the other values going into the database?


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