[rrd-users] Updates once a day

Simone Morandini simone.morandini at mix-it.net
Fri Jan 30 17:38:30 CET 2015

Hello list,

I'm not new to rrdtool but I think I'm missing something basic here.
Within my network I'd like to keep track of the number of free ports on 
a number of switches and, for my purpose, one value per day is enough.
So I created the rrd file as follows:

rrdtool create freeports.rrd --step 86400 DS:eth:GAUGE:172800:0:U 
RRA:AVERAGE:0.5:1:30 RRA:AVERAGE:0.5:7:4 RRA:AVERAGE:0.5:30:6

to have up to a six-month history.
With this setup, when I issue an "rrdtool fetch" command, shouldn't I 
see one row per day? I have the update script running since a week now, 
but I still see one sigle row of output.
On the other hand, with rrdgraph I actually see more than one value 
displayed, but I don't understand why the CLI command returns a single row.

Thanks in advance,

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