Are your date timestamps precisely on the RRDTool step boundaries? If not then there will be some consolidation and calculation going on in there, I think.
I don't know enough about the data you're graphing -- its regularity, it's interval, and so on, or about the graph interval you are using to be able to deduce what consolidation or adjustments may be taking place. You might want to use the /rrdminstepsize option to let RRDTool know the minimum step of your table's data; also the /rrdfillmissing option to extend steps if there are insufficient in the table for what rrdtool needs. Steve Steve Shipway [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Stile Sent: Tuesday, 8 April 2014 7:56 a.m. To: rrd-users Subject: [rrd-users] graph lines differ from actual values I am using rrdtool, libdbi, and mysql to chart thermal data. I noticed the lines are sometimes a little higher than the actual data being plotted, and I would like them to match. Is there something I can change to make the graphed data match the actual data? DEF:cpuPhym=sql//mysql/host=127.0.0.1/dbname=thermal/username=foo/password=b la//temperature/*date/cpuPhy/:min:AVERAGE LINE:cpu0#f601b488:cpu0\\:GPRINT:cpu0:AVERAGE:\%-6.2lf${degree}C COMMENT:\\n _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
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