On Thu, Jul 08, 2004 at 02:47:10PM +0200, Andras Horvai wrote: > Well my fronted create graphs in this manner (focusing --start --end option): > So, do I have to worry about my graphs?
> Weekly (30 Minute Average) > /usr/bin/rrdtool graph - \ > --imgformat=PNG \ > --start=-604800 \ > --end=-1800 \ This (and similar) will fail to select the "weekly" RRA in near to 100% of the time. The RRA selection mechanism tries to match your request as closely as possible, and will end up with time ranges such as "2004-07-01 15:40" to "2004-07-08 15:35". This will be fetched from the 5-minute RRA, not from the 30-minute RRA. Only if the 5-minute RRA hasn't got enough data, the 30-minute RRA will be the best choice. Existing rows with "NaN" are quite different from non-existing rows. This is why expanding the size of an RRA may yield surprising results. Alter the end time to a whole multiple of 1800 (it currently is NOT) and this will overcome the problem. Note that "-1800" is "now-1800" which is not a multiple of 1800 in most cases. HTH 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
