[mrtg] Re: 5 minuttes graph!

Daniel J McDonald dmcdonald at digicontech.com
Wed Sep 12 17:04:08 MEST 2001

Torben Riis questioned:
>1. How does MRTG handle this 5 min periode?
>It is for instance a 2 Mbit F/R that has a full download of 2Mbit in 2
minuttes >30 seconds, and in the last period a download on 0 Mbit. Would it
then be a
>1Mbit plot on the graph or the max peek on 2 Mbit????
>2. Is it possible 2 switch between these two modes. Avg and Max?

It only provides an average.
There is no way to calculate a MAX - all rates are averages.  If you get
down to a small-enough interval (say, 1 bit time) then the rate will either
be 100% or 0%, which isn't terribly useful.  You can only make meaningful
decisions based on average rates over a period of time.

For long term statistics, as MRTG is intended, 5 minutes is a good
compromise.  For short term tactical deployment, you might want to look at 1
second or 10 second averages.  But that's not what MRTG was designed for.

Daniel J McDonald, CCIE 2495, CNX
Principal Network Specialist
Digicon Technologies

Digicon, a Cisco Partner, Silver Certified.

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