Hamish Whittal wrote: > Ok, I did some reading of what Alex said to spamfilter about the graph > getting the 'best' resolution of data. I have managed to figure out most > of what he had to say, but I still don't understand the pixels thing. I > seem to get a stepped graph. This is not what I want, as it looks like > data points are plotted 'between' by real data points. Perhaps someone > would be kind enough to explain the finer points of the pixels in the > grapher.
I think the best way to explain this is: RRDtool is not graphing points. RRDtool is graphing intervals. By the way, RRDtool isn't storing values on a certain time, RRDtool is storing rates over an interval. A plotted interval simply must be a whole number of pixels. If the interval size is large with respect to the total graph time, each interval will be plotted on more than one pixel. Example: your graph is 400 pixels wide. You are plotting a certain DS starting from 12:00 today until 13:00 today. This is 3600 seconds. If each interval is 90 seconds, RRDtool will plot 40 intervals and each interval will be shown on 10 pixels. Does this help? cheers, -- __________________________________________________________________ / [EMAIL PROTECTED] [EMAIL PROTECTED] \ | work private | | My employer is capable of speaking therefore I speak only for myself | +----------------------------------------------------------------------+ | Technical questions sent directly to me will be nuked. Use the list. | +----------------------------------------------------------------------+ | http://faq.mrtg.org/ | | http://rrdtool.eu.org --> tutorial | +----------------------------------------------------------------------+ -- 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
