[rrd-users] add upper and lower limit lines?

[Rob Newman]

Hi RRD users,

In one of my RRD graphs I would like to draw lines of maximum and  
minimum valid value. I have a gauge variable that varies greatly, and  
I want to add a maximum line at +40, and a minimum line at -40. This  
way, anyone who looks at the graph can see if the value plotted from  
the archive is valid or not. I know I can do this with RRD. From the  
documentation (http://oss.oetiker.ch/rrdtool/doc/ 
rrdgraph_rpn.en.html) I see that I can define a VDEF expression.  
Could someone please give me an example of how I would define this  
expression to give the lines that I need? This does not seem to work:

DEF:ds1=/path/to/myrrd.rrd:mass:AVERAGE
LINE1:ds1#000000:"mass position"
VDEF:limits=ds1,-40,40,LIMIT
LINE1:limits#333333:"Limits"

Thanks in advance,
- Rob

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