If you decide to use rrdtool, make certain to check out Alex van den Bogaerdt's tutorials.
RRDtool does not quite work the way people expect and these explanations do a good job of preparing you to expect the data you will get out of it. I've just recently been through this.
In reply to Re^2: Perl module for chart drawing?
by gwadej
in thread Perl module for chart drawing?
by mellin
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