This is normal, expected, and not a bug. Ganglia consolidates data only by AVG, or average. MIN and MAX are not calculated or stored. So when consolidating using MIN or MAX on a graph, you get the MIN or MAX of the AVG.
Data consolidation functions are decided at the time the RRD files are created. You can’t add them in later. Adding MIN and MAX to all the metrics would TRIPLE the size of the database. From: Indranil Chakravorty [mailto:indran...@rediff-inc.com] Sent: Sunday, March 27, 2011 10:55 PM To: ganglia-general Subject: Re: [Ganglia-general] Wrong Max and Min values for Ganglia beyond last hour time range... CONTD Thanks, Neel On Mon, 28 Mar 2011 09:24:52 +0530 "Indranil Chakravorty"<indran...@rediff-inc.com> wrote >Adding one image at a time to keep the size of the mail within limit. Please >note the two images and see how the last year graph scales down the peak value >and in effect the entire historical data. > >Thanks, >Neel > > > On Fri, 25 Mar 2011 18:24:53 +0530 "Indranil > Chakravorty"<indran...@rediff-inc.com> wrote > >The problem ins persistent in the default graphs of Ganglia. For example > >check these graph for "Network" for the last "day" and last "year" in the > >attached images. You will notice that in the "last day" maximum there was a > >peak of about 70 Mb/ps while the graph for the "last year" does not even > >scale beyond less than 10 Mb and the peak indicated is about 8 Mb/ps. > >Ofcourse, the MAX value should not reduce over the year. Anyone who could > >explain the observation? Thanks a lot. > > > >Thanks, > >Neel > > > > On Fri, 25 Mar 2011 15:28:38 +0530 "Indranil > > Chakravorty"<indran...@rediff-inc.com> wrote > > >Hi, I am plotting metrics by using gmetad. I am also displaying the MAX, MIN, AVERAGE and LAST values on the ganglia graph. I realised it today, that the MAX value is correct if you watch the graph for the last hour. However, It is incorrect for any other time range. For eg. If in my last hour the MAX value is 2900, however, when see the last day, week or year the MAX value can be shown as lesser also. It seems ganglia simply gives the average of the MAX values over time ranges beyond last hour. Could anyone please provide me a workaround or a fix? I would be really grateful. > > > > > >Thanks, > > >Neel
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