[mrtg] Re: Maximum Bytes

William Owen William.Owen at ProfilesInternational.com
Thu Sep 30 01:28:02 MEST 2004

>From: Alex van den Bogaerdt [mailto:alex at ergens.op.het.net] 
>Sent: Wednesday, September 29, 2004 6:03 PM
>To: mrtg at list.ee.ethz.ch
>Subject: [mrtg] Re: Maximum Bytes
>On Wed, Sep 29, 2004 at 11:50:59AM -0400, rglauser at areaofficeonaging.com
>> In a basic MRTG graph, what are the correct settings to measure a 10
>> Base T, 100 Base T and gigabit port on a switch?
>  10,000,000 bits per second  ->   1,250,000 bytes per second
> 100,000,000 bits per second  ->  12,500,000 bytes per second
>1000,000,000 bits per second  -> 125,000,000 bytes per second
>However, to allow for some rounding errors and timing errors I
>usually add some 10 percent.

Another good way to handle the rounding/timing errors is to use the
absmax[target]: setting.  I use this a lot to monitor a 2Mbps cable modem.
It is not uncommon to see 110% throughput.  I set MaxByte[Cable_1]: 250000
and absmax[Cable_1]: 1300000 so that MRTG will not discard the >100% values,
but will still calculate a percent utilization based on the purchased
bandwidth.  If you are getting more than you pay for, it is a good thing to
know (as apposed to n/a's).

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