Nagiosgrapher showing different values over time

[Marc Powell]

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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