[rrd-users] Re: How does rrdtool behave if I store 5-minute-values for one year?

Serge Maandag serge.maandag at staff.zeelandnet.nl
Thu Jan 30 16:38:31 MET 2003

You're right,

I was too lazy to think. That's what happens :(


-----Original Message-----
From: Thomas Erskine [mailto:thomas.erskine at sympatico.ca] 
Sent: Thursday, January 30, 2003 4:33 PM
To: Serge Maandag; sh at abovenet.de; rrd-users at list.ee.ethz.ch
Subject: Re: [rrd-users] Re: How does rrdtool behave if I store
5-minute-values for one year?

At 09:41 2003-01-30, Serge Maandag wrote:
 >> So the consolidation is just good for saving disk space?
 >Yes, at least that's the only reason I know.
 >> Am I right, that I would just have to keep 1-year 5-minute-values
 >I can also get the cf MAX out of it?
 >Almost, if you want average values and max values, you need both an
 >AVERAGE and a MAX rra in you rrd database.

If you have only one RRA, with a step of one (i.e. one input data point 
gives one row in the RRA), there is no consolidation, just normalizing
the time.  So you can ask for PRINT:myvar:MAX:... and get a meaningful 
maximum out even though the CF on the RRA is AVERAGE.

However, if you have an RRA or RRAs which do indeed consolidate, then
need to have both a MAX and AVERAGE RRA for those time-spans if you want
get meaningful mamimums out.  If you have only an AVERAGE consolidated
then PRINT:myvar:MAX will be getting you the maximum of the averaged, 
consolidated data.  I.E. the maximums will be low and wrong.  Similarly,
you need minimums, you'll have to have a MIN consolidated RRA.


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