[rrd-users] Re: How does rrdtool behave if I store 5-minute-values for one year?
serge.maandag at staff.zeelandnet.nl
Thu Jan 30 16:38:31 MET 2003
I was too lazy to think. That's what happens :(
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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