Nagiosgrapher showing different values over time

[Palle L Jensen]

Thanks Marc, very good explanation. The link
http://oss.oetiker.ch/rrdtool/tut/index.en.html was good stuff too. 

Thanks,
Palle

> -----Original Message-----
> From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
> bounces at lists.sourceforge.net] On Behalf Of Marc Powell
> Sent: Wednesday, May 14, 2008 5:31 PM
> To: Nagios Users
> Subject: Re: [Nagios-users] Nagiosgrapher showing different values over
> time
> 
> 
> On May 14, 2008, at 3:48 PM, Palle L Jensen wrote:
> 
> > Thanks for you response. I understand, but The question I had is why
> > are the
> > peaks that are showing on the daily and weekly graphs not appearing
> > on the
> > monthly and yearly graphs?
> 
> The RRD stores and graphs 1 point for every 5 minutes for the daily
> RRA. You see every data point on the graph, including the peaks.
> 
> 1 10 20 5 6 8 ...
> 
> Weekly RRA/graph shows 1 data point for every 30 minutes. The data
> must be normalized based on a Consolidation function. Typically that's
> Average so the above 5 minute intervals would result in a single data
> point of 8.33333 graphed and stored in the weekly RRA.
> 
> 'Monthly' RRA/graph shows 1 data point for every 2 hours. The 30
> minute data points above are once again averaged (or whatever the
> Consolidation function is) over the 2 hour interval and used to
> generate the monthly RRA and graph.
> 
> 'Yearly' RRA/graph shows 1 data point for every day.  The 2 hour
> intervals above are consolidated into one data point for the entire day.
> 
> As you've discovered, there are other consolidation functions which
> are available but the RRD file must be told which will be used at
> creation time. Looks like the PNP guys included MAX for at least some
> of the RRA's.
> 
> Alex Van Den Bogaerdt has written an excellent RRD Tutorial that
> covers this and much more at
> http://oss.oetiker.ch/RRDtool/tut/RRDtutorial.en.html
> .
> 
> --
> Marc
> 
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