[rrd-users] Re: odd spikes due to early resets
cliftonr at lava.net
Tue Feb 20 20:32:07 MET 2001
On Tue, Feb 20, 2001 at 09:51:02AM +1030, BAARDA, Don wrote:
> Hence the probability of incorrectly interpreting a reset as a valid wrap
> err_probability = (specified_max / measurable_max)
> measurable_max = (counter_max / step)
> For a typical application of a 32bit counter, 1Mbps interface, and
> 5min step this works out as;
> err_probability = ( (10^6 / 8) / ( 2^32 / 300) ) = 0.8%
> This is _very_ low!!!
I have to disagree with you on this, if I understand what you are
A probability of nearly 1% in a given sample is a very high probability
when you are doing samples on thousands of interfaces, thousands of
times per day.
It brings the probability of invalid spikes in the data to near
certainty - which is exactly what many users are complaining about and
discussing remedies for.
Clifton Royston -- LavaNet Systems Architect -- cliftonr at lava.net
"WWJD? JWRTFM!" - Scott Dorsey (kludge)
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