[mrtg] Re: Log Aggregation

[Alex van den Bogaerdt]

On Wed, Jul 02, 2003 at 10:33:04AM -0400, James Amann wrote:

> I am trying to confirm that the MAX values are never averaged.  Meaning if I recive a value that is the max for a 5 min period, when aggregated into the 1/2 hr period, if it is still the max value of the other 5 min slices for the 1/2 hour, it will still be the max, and so on.
> 
> I have looked through the docs and cannot confirm from what I found, and I have always assumed that the maximum value would propogate to the last aggregation at 1 day without any averaging, but we are seeing something in our logs that forces me to ask the question.

Perhaps you should share this "something" with us...

The way MRTG should work:

5-minute average #1 \
5-minute average #2  \
5-minute average #3   \ 30-minute average = (#1+#2+#3+#4+#5+#6)/6
5-minute average #4   / 30-minute maximum = max(#1,#2,#3,#4,#5,#6)
5-minute average #5  /
5-minute average #6 /
5-minute average #1 \
5-minute average #2  \
5-minute average #3   \ 30-minute average = (#1+#2+#3+#4+#5+#6)/6
5-minute average #4   / 30-minute maximum = max(#1,#2,#3,#4,#5,#6)
5-minute average #5  /
5-minute average #6 /

and so on;  dito for 30-minutes --> 2 hour and so on.

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