Hi, I'm a new user of rrdtool, and I have a few questions about it. I have read most of the tutorials and documentation, but I still haven't figured out a few things.
Here's what I'd like to do: I collect data from a series of sensors and I'd like to store these values on a database. Latter, I'd like to plot a graphic out of a certain portion of time. For example, suppose I get 2 samples (x and y) once a second, for 24hrs (that's 86400 seconds). (I want to store all the samples, 2 per second) Following your documentation, I created: rrdtool create samples.rrd -b 920000000 -s 1 \ DS:x:GAUGE:2:U:U \ DS:y:GAUGE:2:U:U \ RRA:AVERAGE:0.5:1:84000 (please correct me if I'm wrong in the above command) Do I really need to use rows=84000 in RRA? is it possible to "increase-rows-as-you-go" ? then I added a few sample values: rrdtool update samples.rrd 920000001:1:2 920000002:2:3 920000003:3:4 rrdtool update samples.rrd 920000004:4:5 920000005:5:6 920000006:6:7 rrdtool update samples.rrd 920000007:7:8 920000008:8:9 920000009:9:10 and retrieved them with: rrdtool fetch samples.rrd AVERAGE -s 920000001 -e 920000009 The resulting values started at 920000002, and ended at 920000010. Shouldn't I get samples between 920000001 and 920000009 ? Then I did a sample plot: rrdtool graph samples.png -s 920000000 -e 920000009 \ --x-grid SECOND:2:MINUTE:1:HOUR:1:0:%X \ DEF:xx=samples.rrd:x:AVERAGE LINE1:xx#FF0000 \ DEF:yy=samples.rrd:y:AVERAGE LINE1:yy#00FF00 I did get a .png with the correct values, but the "x" grid is missing from the graphic. How can I make it appear? Also, I'd like to select the greater of the values in each 10 sample, so I could plot 3600 samples in a 360 pixels wide graphic. Can this be done? thanks, 770dev _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
