[rrd-users] Re: How does rrdtool behave if I store 5-minute-values for one year?
thomas.erskine at sympatico.ca
Thu Jan 30 16:33:11 MET 2003
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 and
>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 of
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 you
need to have both a MAX and AVERAGE RRA for those time-spans if you want to
get meaningful mamimums out. If you have only an AVERAGE consolidated RRA,
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, if
you need minimums, you'll have to have a MIN consolidated RRA.
>From: Stephan Harren [mailto:sh at abovenet.de]
>Sent: Thursday, January 30, 2003 2:29 PM
>To: Serge Maandag; rrd-users at list.ee.ethz.ch
>Subject: Re: [rrd-users] How does rrdtool behave if I store
>5-minute-values for one year?
>Am I right, that I would just have to keep 1-year 5-minute-values and I
>also get the cf MAX out of it?
>Am Donnerstag, 30. Januar 2003 13:48 schrieb Serge Maandag:
>> rrdtool uses the values the rrd holds. For the given time frame you
>> to graph, it will try to take the highest resolution data.
>> If you just store 5 minute samples, it will never even think of using
>> 2 hours average.
>> 2 hours average samples can only be displayed if your rrd database has
>> an RRA that averages over 2 hours.
>Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
>Help mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Thomas Erskine <thomas.erskine at sympatico.ca> +1.613.591.8490
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help mailto:rrd-users-request at list.ee.ethz.ch?subject=help
More information about the rrd-users