[rrd-users] Re: Starting problems

[Alex van den Bogaerdt]

Jeroen Timmer wrote:

> I read the tutorial that Alex wrote (nicely done btw.) But now I seem to be
> stuck :)

bedankt!

> Rrdtool update router.rrd -t input:output N:$in:$out
> 
> When I print the two strings I get the output I want, but when I check the
> rrd file I get the famous NaN :/

RRDtool works with intervals.  This said it is obvious that you
need at least two updates.  Also, these updates should not be
further apart than the heartbeat value and they should include
one complete normalized interval.

> Whats that piece with unknown_sec btw. ??

Look into normalization, interpolation et cetera.  For now,
just accept that RRDtool needs this value to do its job.

cheers,
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