Hello everyone, i have a problem with RRDTool. I have read the tutorials and think to know the syntax and usage of rrdtool now. But i have a problem with my understanding of the "step" option! The tutorials don't explain that very well.
I have a MySQL database filled with sensor values and its corresponding timestamps. I have written a little script that reads these values and creates the "/usr/bin/rrdtool update" commands to fill them to a rrd. (and executes it) I created a rrd: rrdtool create test.rrd --start 1198454571 --step 60 DS:procs:GAUGE:600:0:1000 RRA:AVERAGE:0.5:1:100 And my script executed this commands: /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198454571:257 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198454631:258 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198454691:256 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198454751:255 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198454811:256 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198454871:259 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198454931:258 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198454991:257 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198455051:257 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198455111:255 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198455171:255 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198455231:256 /usr/bin/rrdtool update /var/lib/test/graphs/test.rrd 1198455291:256 Now i try to fetch the data: rrdtool fetch test.rrd --start 1198454571 AVERAGE 1198454580: nan 1198454640: nan 1198454700: nan 1198454760: nan 1198454820: nan 1198454880: nan 1198454940: nan 1198455000: nan 1198455060: nan 1198455120: nan 1198455180: nan 1198455240: nan 1198455300: nan 1198455360: nan What went wrong? I am sure the graph won't display anything useful so i don't even create one. When i look at the timestamps i think i totally misunderstood the step and start option. Can anybody help me? Thank you and merry christmas! Lennart _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
