[smokeping-users] Re: RRDTool Filling In Unknown Values For Missing Pings

Tobias Oetiker oetiker at ee.ethz.ch
Thu Jan 6 07:33:59 MET 2005

Yesterday hkclark at yahoo.com wrote:

> Is there a way to prevent RRDTool from filling in
> unknown values from missing pings with the time from
> the previous set of 20 pings?  For example, say 8 of
> the 20 pings fail, but just for a single "round" of
> pings (all 20 of the previous "round" succeeded).  An
> "rrdtool dump" shows that the 8 missing pings in the
> "current round" have been filled in with the previous
> round's numbers.  Is there a way to stop this
> behavior?

Hi Kennedy,

the 'problem' is that rrdtool does not store the actual data but
rather time-wise equi-spaced points on an interpolated curve ...
with the pings this is a bit odd, as there is not realy a
relationship between the second fastest ping in the first round and
the second fastest ping in the second round ..., nevertheless it
does work very well for drawing the 'smoke' but you should not try to read
anything else into this data unless you have fully explored the
inner workings of the Round Robin Database system and are sure the
data does contain the information you are interested in ...


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