Hi everybody!
I've a question on rrdtool create command. What I don't understand is in
rrdtutorial, part "A Real World Example". I quote a paragraph:
<quote>
1 sample "averaged" stays 1 period of 5 minutes
6 samples averaged become one average on 30 minutes
24 samples averaged become one average on 2 hours
288 samples averaged become one average on 1 day
Lets try to be compatible with MRTG: MRTG stores about the following
amount of data:
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
These ranges are appended so the total amount of data kept is approxi-
mately 797 days. RRDtool stores the data differently, it doesn't start
the "weekly" archive where the "daily" archive stopped. For both
archives the most recent data will be near "now" and therefore we will
need to keep more data than MRTG does!
We will need:
600 samples of 5 minutes (2 days and 2 hours)
700 samples of 30 minutes (2 days and 2 hours, plus 12.5 days)
775 samples of 2 hours (above + 50 days)
797 samples of 1 day (above + 732 days, rounded up to 797)
rrdtool create myrouter.rrd \
DS:input:COUNTER:600:U:U \
DS:output:COUNTER:600:U:U \
RRA:AVERAGE:0.5:1:600 \
RRA:AVERAGE:0.5:6:700 \
RRA:AVERAGE:0.5:24:775 \
RRA:AVERAGE:0.5:288:797 \
RRA:MAX:0.5:1:600 \
RRA:MAX:0.5:6:700 \
RRA:MAX:0.5:24:775 \
RRA:MAX:0.5:288:797
</quote>
So the question is: Why do I need more samples with rrd then with mrtg? Or if I
want to watch 732 day-values, why I define 797 day-values to store? I'm not
native English, maybe I missed something. Could anyone explain it to me?
Thanks
Mody
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