> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:rrd-users- > [EMAIL PROTECTED] On Behalf Of Dan Gahlinger > Sent: Saturday, September 01, 2007 9:31 AM > To: [EMAIL PROTECTED]; [email protected] > Subject: Re: [rrd-users] newbie rrd question - probably a very old issue >
> > in our case, we only had 2 days worth of data, actually less than 1000 > bits > of data. > so on the weekly graph there are enough points. > > on the graph we can clearly see the "90" spike on the daily graph, but the > weekly graph, that days spike has been changed to "30" and is plotted as > 30. > this is very bad. it shouldn't happen. Look at it this way. Assuming 5 minute samples, there are 288 data points in 1 day. On a 300 pixel wide graph, you have enough space to graph each single data point and then some. Now you ask rrdtool to graph a weeks worth of data points in a 300 pixel wide graph. There are 2016 possible data points from which it must choose only 300 to display. How should it do this? RRDTool uses the best fitting RRA and the consolidation function you specify (likely AVERAGE). The fact that you only have two days of data doesn't mean RRDTool is going to change the way it creates a weekly graph. You've told it to graph a weeks worth of data so it'll do the best it can to show you a weeks worth of data, NAN or not. You only had two days worth of data but still asked rrdtool to show 7 days worth. It will, properly, consolidate what you have to fit the two days and show 5 days worth of NAN data. -- Marc _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
