If I may add, this is why it helps to know how you are going to want to analyze the data up-front. For example, we have several RRAs, holding various size samples for periods of 8 hours, 28 hours, 8 days, 35 days, and 380 some days. This way, we can get a fairly good estimate for any data period we would like, up to a year ago. It took some tuning to get this to work right, and it wasn't magic..and in fact quite a few of our RRAs are still giving some horrible averages, but we're patiently working through them. It just requires a lot of time, logic, and staring at examples. :)
--Brian -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Serge Maandag Sent: Wednesday, January 26, 2005 9:48 AM To: nero freak Cc: [email protected] Subject: [rrd-users] Re: A doubt on RRD database > So RRD is a FIFO. Is this a file-based DB? Yes. > Looked at the docs and it says that we can define the database size at > creation time. By this, if I define a size for x samples during a > month, then after a month, the saved data will be overwritten with new > collected data for the following month. In this situation how can I > analize the flow for, e. g., 5 months? > Well it's a FIFO, so everytime a value is added the oldest value Gets shifted out. say your RRA holds 5 minute samples for a month, starts at 2000-01-01 00:00:00 and ends at 2000-01-31 23:55:00. Then after an update on 2000-02-01 00:00:00, the RRA will start at 2000-01-01 00:05:00 and end at 2000-02-01 00:00:00. And this is valid for every RRA. Serge. ------------- Op de inhoud van dit e-mailbericht en de daaraan gehechte bijlagen is de inhoud van de volgende disclaimer van toepassing: http://www.zeelandnet.nl/disclaimer.php -- 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 -- 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
