[rrd-users] Re: question regarding max/min

[Alex van den Bogaerdt]

David Gabler wrote:

> I have been reading the manuals and tutorial but for the life of me can not
> seem to understand max/min.  I know that it is the max min values but what I
> am unsure about is how the data is stored.  If I was to say
> RRA:MAX:0.5:1:100 (with a default step of 300) would it keep 100 5 minute
> maximums?  But if that is so it does not make sense.  The reason I say that
> is I am just keeping the last 100 entries which makes absolutely no sense.
> <- where I get confused.

MIN and MAX are better understood when you start consolidating.
a) RRA:MAX:0.5:2:100
b) RRA:MIN:0.5:2:100
c) RRA:AVERAGE:0.5:2:100
consolidating two values, 1000 and 2000, results in:
a) 2000    this is max(1000,2000)
b) 1000    this is avg(1000,2000)
c) 1500    this is min(1000,2000)

Of course, "consolidating" only one value does not do much.

See also the faq site (http://faq.mrtg.org/) for more information,
especially the 2nd entry on the main page.

cheers,
-- 
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