[mrtg] Re: Graphing negative values.. again

[Jeff Cook]

You could add 15 to to the returned value.  That way you aren't dealing with
a negative value.
-----Original Message-----
   >From: "Simon Westlake" <simon.westlake at bizwi.rr.com>
   >Sent: 11/5/03 12:06:34 PM
   >To: "mrtg at list.ee.ethz.ch" <mrtg at list.ee.ethz.ch>
   >Subject: [mrtg] Graphing negative values.. again
   >
   >Still working on it..
   >
   >To recap, I'm graphing a value which fluctuates from about -15 to +15. I
set the maxvalue to 50.
   >
   >When the data was coming in, MRTG was not displaying anything below 0.
It would graph values above 0.
   >
   >I tried the following command to 'tune' the rrd files:
   >
   >rrdtool tune */*.*.*.*+b.rrd -i ds0:-50 -a ds1:50
   >
   >My rrd files that contain the information are in this format:
ipaddress+b.rrd. 
   >
   >This didn't appear to do anything, so I tried it specifying a file
rather than using *.*.*.* - this provided some interesting results.
   >
   >The graph still begins at 0 but its graphing a line BELOW the beginning
of the graph. Below is exactly what is displayed.
   >
   >Max dB  	 -9.4 dB  	 	Average dB  	 dB
Current dB  	 dB
   >Max dB 	 -9.2 dB 		Average dB 	 -9.4 dB
Current dB 	 dB
   >
   >
   >As you can see, some things are being filled in while others are not.
(I'm graphing the same OID twice.)
   >
   >Anyone have any ideas? I've tried deleting the .png files and having
them regenerated, same problem. Note that only the file I specified by name
works - when I did *.*.*.*+b.rrd I still get no data for anything below 0.
   >
   >- Simon Westlake
   >- Road Runner Network Specialist
   >- [414 688 7956]
   >- [AIM: swestlake1320]
   >
   >
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