[rrd-users] threshold graph in rrdtool.

[Young, Jeff]

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
 
 
HRULE:$threshold#22FF22:Threshold"
DEF:PRE$attribCounter=$fileName:$attrib:AVERAGE
CDEF:BYTES$attribCounter=PRE$attribCounter$formula,$threshold,LT,0,PRE$attri
bCounter$formula,IF
 
 
This gives a reasonable result but there are a few aspects that still bug
me.
 
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
value.
 
2) I also build up a legend under the graph
 
LINE2:BYTES$attribCounter#$colours[$colour]:@anno ($unit)$fill
GPRINT:BYTES$attribCounter:MAX:%6.2lf%s 
GPRINT:BYTES$attribCounter:MIN:%6.2lf%s 
GPRINT:BYTES$attribCounter:AVERAGE:%6.2lf%s\\n
    
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 ?
 
Jeff
    
 
 


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