[rrd-users] multiple RRAs in a single RRD
jamesb-lists at alongtheway.com
Wed Nov 20 22:12:57 MET 2002
Hi, I've been using RRDTool for about a day now, and I think it's great.
However I have a question. I have noticed that in some sample
RRD-creating scripts I've seen online (including the one in the tutorial),
some people use more than one RRA in a single RRD.
rrdtool create test.rrd \
--start 920804400 \
What is the advantage of having multiple archives (with different sample
intervals) if you are only graphing one of these?
For example, if I am graphing network i/o on a system and taking samples
every 5 minutes, why would I also want to create another RRA which takes
samples once per hour? I realize that would make a useful graph as well,
but I don't see how to "get it out" of the RRA when you graph it, since
it's under the same Data Source; so as far as I can tell the only way to
determine hourly results based on the above RRD would be to extrapolate
your 5-minute samples. But I'm sure I must be missing something!
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