You're right, I was too lazy to think. That's what happens :(
Serge. -----Original Message----- From: Thomas Erskine [mailto:[EMAIL PROTECTED] Sent: Thursday, January 30, 2003 4:33 PM To: Serge Maandag; [EMAIL PROTECTED]; [email protected] 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 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. > -- 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
