[rrd-users] Why do I see NaN values?

Leon Stringer leon.stringer at ntlworld.com
Thu May 22 10:17:12 CEST 2008

> From: Alex van den Bogaerdt <alex at ergens.op.het.net>
> Date: 2008/05/21 Wed AM 10:04:36 GMT
> To: rrd-users at lists.oetiker.ch
> Subject: Re: [rrd-users] Why do I see NaN values?
> On Wed, May 21, 2008 at 09:35:34AM +0000, Leon Stringer wrote:
> > 
> > I've created an RRD database to store a value (server clock offset in
> > ms). I've created a cron job to add the value every 6 hours. As far
> > as I can tell the job is running correctly and getting a valid value.
> > However, when I run rrd fetch I get a lot of NaN values (between a
> > quarter and a third of values) so the generated graphs have gaps too.
> > 
> Short answer: because you are using timestamp "N" and heartbeat 21600.

Thanks Alex. I now specify the timestamp and it's working as expected.

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