# [mrtg] Re: Graphs get smaller over time??

Lindahl, Carl crl at rti.org
Fri Feb 21 17:36:33 MET 2003

```Yes that is normal behavior. The first graph is a 5 minute interval. The 2nd
graph, the weekly graph takes a 30 minutes average and graphs those points.
For it to show the same amount of traffic for weekly as daily, you would
have to sustain a certain amount of traffic for 30 minutes. The monthly
graph takes 2 hours averages, and the yearly graph takes 1 day averages. The
1 day averages are what really kill the traffic graphs.

Remember in school when you had an A average and got 0 on one thing and it
dropped you down to a B? Well same thing in effect here. You push traffic
for 8-12 hours through out the day, but you have another 12-16 hours where
you are really not doing anything and that drops the average traffic WAY
down. If you look at an internet peering point where traffic is moving about
the same 24x7, the yearly graph is a much better representation of traffic
vs. trying to graph a link that gets used only 8-12 hours out of the day.

Anyone please correct me if you think I'm wrong....

Carl

-----Original Message-----
From: Leen Smit [mailto:leen at webmind.nl]
Sent: Friday, February 21, 2003 10:25 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Graphs get smaller over time??

Hi Guys!

Ive been running MRTG for some days now on our pix to get the total
bandwidth usage, but i noticed that the weekly, monthly and yearly graph get
smaller, compared to the daily graph. (see
http://193.172.16.239/pix/outside2.html )
As you can see there, there is obivous more traffic then allowed on a daily
basis, but if i look at the monthly graph, all the values are below the set
limit (not to mention the yearly one)? Is this something i can fixed in the
config files?? or is this normal, since its 'averaging' the values?

Any light on this would be greatly appreciated!

(PS, yes, its in dutch, but the order of the graphs are the same dwmy  ::))

Leen Smit

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