[rrd-users] DERIVE - basic question

[Bill Z.]

I've gone through the tutorials & manuals, but could not find a thorough
explanation or demo of the use of DERIVE.  Here are the two DBs I created:

rrdtool create nsm1.rrd     \
  --start 1075810000        \
  DS:events:COUNTER:600:U:U \
  RRA:AVERAGE:0.5:1:105120

rrdtool create nsm2.rrd     \
  --start 1075856400        \
  DS:eventd:DERIVE:600:U:U  \
  RRA:AVERAGE:0.5:1:105120

And I updated them in the following way (in a shell script):

events=......(from input source)
eventd=$events
/usr/local/bin/rrdtool update nsm1.rrd "$mytime:$events"
/usr/local/bin/rrdtool update nsm2.rrd "$mytime:$eventd"

However, the 2 graphs look the same -- as a matter of fact, the 2 DBs are
exactly the same!  Why??

Hints will be much appreciated!   -Bill

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