[rrd-users] Re: Data entries not appearing

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Wed Dec 26 22:14:47 MET 2001

Paul Jennings wrote:

> I am gathering data from some wireless radios via
> snmpget with a script that runs every five minutes.  I
> set up a database for each radio with the following
> command:
> rrdtool create radio1.rrd --step 300
> DS:btx:COUNTER:600:U:U DS:brx:COUNTER:600:U:U
> DS:rssi:GAUGE:600:U:U RRA:AVERAGE:0.5:1:288
> RRA:LAST:0.5:1:600

Assuming the counters are really counters: looking good.
Just to make sure: you have to run this once, not every
time.  It has happened before that someone had this cmd
every time :)

> I have the script set up to dump the values to the
> screen, so I know I'm getting them from snmpget.  The
> script runs the following command to update the
> database (the actual numbers are just examples...):

Try saving the commands to a separate file.  You can use
this to debug your problem *and* to generate a small example
when we ask for it.

> rrdtool update radio1.rrd N:16319:38384:78
> If I try this command to view some data, all values
> show NaN:
> rrdtool fetch radio1.rrd LAST

You should have 600 * 300 seconds worth of data in that RRA
(after a while of course, not right away).

To debug this:
1) check that the time stamp of the RRD file has changed after
   an update.  If not, there's something going wrong with your
   update command
2) make sure to see errors when they occur.  Things like
   "1>/dev/null 2>&1" should be avoided at all times, especially
   when debugging a problem
3) If you don't succeed to debug the problem, create a small
   example script and send a few lines of update commands.
   Make sure to use the time, not "N" in the update command.

 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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