On Mon, May 10, 2004 at 09:45:26AM +0200, Fernando Nieto wrote: > Then if I receive the values 1,3,1,5,1 for one DS at t0, t1, t2, t3... my > rrd will store exactly those values: > > AVERAGE RRA MAX RRA > 10:00 1 1 > 10:05 3 3 > 10:10 1 1 > 10:15 5 5 > 10:20 1 1 > > and these are also the values I get when I use rrdtool fetch. With steps=1, > the RRA will store exactly the same values even if I use AVERAGE, MAX, MIN > or LAST.
Indeed. > When I graph these data I think I should see the same info as when I fetch > it, even if my graph is 400x100 or 600x200. Nope. If one pixel describes the time between 10:00 and 10:15, the values used are: 3 (10:00 to 10:05) 1 (10:05 to 10:10) 5 (10:10 to 10:15) If you display the minimum, 1 will be selected. If you display the average, 3 will be computed. If you display the maximum, 5 will be selected. If you display the last, 5 will be selected. If one pixel describes the time between 10:00 and 10:10, the values used are: 3 (10:00 to 10:05) 1 (10:00 to 10:10) If you display the minimum, 1 will be selected. If you display the average, 2 will be computed. If you display the maximum, 3 will be selected. If you display the last, 1 will be selected. Different results, because of a different time span. If this still does not makes sense, I cannot explain it to you. Alex -- 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
