[rrd-users] add upper and lower limit lines?
rlnewman at ucsd.edu
Mon Oct 23 23:50:25 MEST 2006
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
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:
Thanks in advance,
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