[rrd-users] Re: rrdupdate with UNKNOWN and 0 value

[Serge Maandag]

> > please try creating a demo script using absolute time including an 
> > absolute --start time when creating the rrd file ...
> 
> I'm not sure what you're suggesting here.

Salvatore,

Tobias will look into it, but ofcourse he does not want to spend an hour
trying to recreate the problem only to find out that he doesn't see what
you see.

What he wants to see the exact commandos you use to prove it goes wrong.
So post an exact copy of wahat you did like:

rrdtool create bla.rrd --step 300 \
DS:ds0:COUNTER:600:0:U DS:ds1:GAUGE:600:0:U \ 
RRA:AVERAGE:0.5:1:600

rrdtool update 1122418510:U:0
rrdtool update 1122418810:U:0
rrdtool update 1122419210:U:0

rrdtool fetch ... | tail -10

Note that you shouldn't use N: in the update line. Use an exact
timestamp,
like I did. Toby can not reproduce N: because he does not know what time
you performed the test.

Also, A single N: update will always yield an UNKOWN value. rrdtool 
interpolates values, so it needs 3 updates around a PDP to calculate the

average. It's in the rrdtool tutorial.

Serge.

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