[rrd-users] Re: About logging the REAL valuesn

Enrique Sanchez Vela enrique_sanchez_vela at yahoo.com
Tue Aug 22 23:29:39 MEST 2000

--- Alex van den Bogaerdt <alex at slot.hollandcasino.nl>
> Tobias Oetiker wrote:
> > *> 2) disallow AVERAGE on this DST.  It is okay to
> use MIN,MAX and LAST.
> > 
> [...]
> > Using MAX and MIN is a different issue all
> together because rrdtool
> > clearly defines that it FIRST builds an average
> value over the
> > defined step interval and then takes the MIN and
> MAX of these
> > average intervals ... If you need more precision
> (or higher peaks
> > for that matter) you must have shorter sampling
> intervals ...
> I have no problem with the average values.  When
> averages are used, you
> simply *must* use the correct timestamp.  However,
> when logging minima
> or maxima it is wrong (IMHO) to average the value
> first and then take
> the minimum (maximum) of the averaged (altered!)
> value.
> Shorter sample intervals help a bit here; they do
> not solve this problem.

 I dont mean to be a smart a.. but I think Tobi made
this very clear, the MIN and MAX values are calculated
out of the averaged values, if we dont like it or does
not work for us and Tobi does not agree on changing
it, then we have two choices here, either stop using
rrd or fix it for local use.


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