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. >serge. > >-----Original Message----- >From: Stephan Harren [mailto:[EMAIL PROTECTED] >Sent: Thursday, January 30, 2003 2:29 PM >To: Serge Maandag; [email protected] >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 >can >also get the cf MAX out of it? > >Best regards, > >Stephan >Am Donnerstag, 30. Januar 2003 13:48 schrieb Serge Maandag: >> rrdtool uses the values the rrd holds. For the given time frame you >want >> 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 >a >> 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:[EMAIL PROTECTED] >Help mailto:[EMAIL PROTECTED] >Archive http://www.ee.ethz.ch/~slist/rrd-users >WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi Thomas Erskine <[EMAIL PROTECTED]> +1.613.591.8490 -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/rrd-users WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi
