[mrtg] Re: mrtg newbye problem

[Koelstra, J. (Jan)]

Giuseppe,

You should be aware that adding 2 values will disrupt the counter rollover mechanism. For every time a counter rollover (or a counter reset) occurs in either of the 2 individual targets you get a false result.
So the closer the combined maxbytes value is to the rollover value the less reliable your graph becomes.
The rollover value for the common counter is (2^32)-1, or when calculated to a bitrate per second during a 5 minute interval about 114Mbit/s

Beside: In most cases where you add 2 indepedent values together you should also add the 2 maxbytes values together.

HTH,

Jan.


-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch] On Behalf Of Giuseppe Parlato
Sent: Monday, April 03, 2006 5:30 PM
To: Daniel J McDonald; mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: mrtg newbye problem


I have these:

First server:
PageTop[sqlserver.bytesec]: <H1>Bytes per secondo</H1>
Target[sqlserver.bytesec]: 35:7929ctoctsic at ..IP..
Title[sqlserver.bytesec]: Bytes per secondo
MaxBytes[sqlserver.bytesec]: 262144
Options[sqlserver.bytesec]: bits
WithPeak[sqlserver.bytesec]: wmy

Second server:
PageTop[webserver.bytesec]: <H1>Bytes per secondo</H1>
Target[webserver.bytesec]: 28:7929ctoctsic at ..IP..
Title[webserver.bytesec]: Bytes per secondo
MaxBytes[webserver.bytesec]: 262144
Options[webserver.bytesec]: bits
WithPeak[webserver.bytesec]: wmy


Then to have the tot value:
PageTop[server.bytesec]: <H1>Bytes complessivi per secondo</H1>
Target[server.bytesec]: 35:7929ctoctsic at ..IP.. + 28:7929ctoctsic at ..IP..
Title[server.bytesec]: Bytes complessivi per secondo
MaxBytes[server.bytesec]: 262144
Options[server.bytesec]: bits
WithPeak[server.bytesec]: wmy

... but sometimes the + result it is right, sometimes it is not!
completely.. do I make some mistake ?

Giuseppe

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