[mrtg] MRTG and RRD

[Simon Hall]

Hello,
Recently after some investigation after some queries about the MRTG logs I
have discovered that over time data gets summarized/averaged.  The main
reasons I can see for this are to maintain manageable sized log files and
that each graph requires a particular amount of data to be generated.  I am
sure it is documented somewhere, but I have not been able to find out the
exact reasons.  After looking into the RRD tool and the tutorials I came
across this snippet of information about the MRTG logs.  I found it in the
First Steps Tutorial for the RRD tool by Alex van den Bogaerdt
http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/tutorial/rrdtutorial.html
under the heading of "A Real World Example" it discusses MRTG logs 
 600 5-minute samples:    2   days and 2 hours
 600 30-minute samples:  12.5 days
 600 2-hour samples:     50   days
 732 1-day samples:     732   days

All this is very interesting.  But I need to be able to generate graphs on
demand for any period down to a 5 minute interval.  I have read the
documentation on RRD, but it is still not clear to me if on using mrtg and
RRD together I would be able to generate daily graphs for any period in the
past.  Could someone give me a definitive answer.

Kind Regards

Simon Hall


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