[rrd-users] Howto show "LAST-MIN" in a graph?
sven at bawue.net
Thu Sep 1 16:12:27 MEST 2005
I monitor my central heating with cacti including a solar panel on the
roof. I use rrdtool and cacti to visualize it.
I want to show the user the current difference of kWh in each graph.
So my calculation-thinking is:
DIFF = LAST-Value - MIN-Value
I put this into the following CDEF-definition inside cacti:
and put it into the legend with GPRINT.
But the graph is broken, this is the debug code:
/usr/local/rrdtool-1.2.11/bin/rrdtool graph - \
--title="CAPITO Solarbilanz" \
AREA:a#EA8F00:"Solarbilanz in kWh" \
I wonder why there is:
the "0" should be something like the minimal value, right?
Did anybody manage to get something like this working?
I know this is a little specific to Cacti I tried it in the Cacti forum
and mailinglist as well. But nobody there seems to know.
A solution just with rrdtool and without cacti-features is okay.
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