[rrd-users] Re: rrdtool missed values <1.0

Alex van den Bogaerdt alex at ergens.op.het.net
Fri Sep 1 13:43:32 MEST 2006

On Fri, Sep 01, 2006 at 09:52:02AM +0000, Thomas Peter wrote:

> ok, so i do misunderstand the meaning of the heartbeat.
> if i expect a heartbeat of x and update at a time y with x<y i miss all my
> values?
> (ok that sounds like what heartbeat could be for ;)

Yep, I think you got it now.

> just an example (hopefully won't break due non fixed-width-fonts)
> heartbeat:x
> update time:y
> x    x    x    x    x    x    x    x    x    x    x
> y    y           y  y      y    y     y y    y    y
> the first two updates make it through the rra, the 3. doesn't. ok.
> how about the 4.?
> the following updates 5-7 miss their slot. and the 8th? is it accepted, or is
> only the 9th the first one, that makes it?

Heartbeart is not a timestamp.  It is not a point in time.  It is an interval.
This means most of your 'x'es are wrong.  You need a ruler and measure the
distance between each 'y'.

Quick look, could be slightly wrong:

1,2 make it. 3 doesn't. 4 makes it, 5 not, 6 does, 7 not, 8,9 and 10 make it.

Why 6?  Because the time difference between 5 and 6 seems to be short enough.

> whoo. the rrd-topic looks so simple on the first sight, but can get rather
> complex if you want to fully understand the basics.

And then you're only halfway there.

Alex van den Bogaerdt

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