[rrd-users] Re: threshold graph in rrdtool.

Thomas Erskine thomas.erskine at sympatico.ca
Fri Aug 8 17:17:08 MEST 2003

At 10:55 2003-08-08, Young, Jeff wrote:
 >I've been using rrdtool for a while to graph TX and RX MB/s via all ports on
 >brocade fibre switches.  I have recently added a feature where the user can
 >specify a threshold value.  The idea is that all values below this given
 >value will be ignored in the graph.  So if we want to see all ports running
 >over 45 MB/s I set a threshold of 47185920.
 >In detail I am simply reducing to zero any values that fall below this
 >threshold. ie

Urg.  What's wrong with "--lower-limit 47185920 --rigid".  This should be a 
bit faster (avoiding CDEF) and simpler.

 >This gives a reasonable result but there are a few aspects that still bug
 >1) Below the threshold I still see the graphing lines.  They are the
 >vertical lines that join the last 'zero' value of the data to the first
 >'above threshold' value of data.  I would like a way of not drawing this
 >part of the line.  I could do it by defining two CDEFs and drawing the lower
 >section in white ( background ) and the over section in line_colour.  This
 >is the way i'll go if no one has a better idea.
 >Is it possible to do something with the vertical axis so I effectively pull
 >down the 40Mb line to where the 0Mb line was ? This way I miss out all the
 >un-interesting bit and get a nice graph that starts at my given threshold
 >2) I also build up a legend under the graph
 >LINE2:BYTES$attribCounter#$colours[$colour]:@anno ($unit)$fill
 >I need a way of NOT adding legend lines for those line that fall below the
 >given threshold. ie if BYTES$attribCounter:MAX < threshold then miss out
 >this GPRINT.
 >Any ideas ?
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Thomas Erskine <thomas.erskine at sympatico.ca> +1.613.591.8490 

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