how the 30 min avg is calculated and stored in log file

[Yagnesh]

Hi All,

I am aware that the first 600 samples in the log file are of 5 min avg. value, the rest 600 are averaged out to 30 min avg followed by 2 hours avg, then 24 hrs avg.

 Can any tell me how MRTG calculates this 30 min avg. I mean does MRTG takes the 6 data point sampled at 5 min interval and then add all the 6 data values, then divide by 6 to get the 30 min avg. Or is there some other calculation.

Please help me to find the answer  to this.

Regards,
Yagnesh Dave
[phone]

[S Shipway]

>  Can any tell me how MRTG calculates this 30 min avg. I mean does MRTG
> takes
> the 6 data point sampled at 5 min interval and then add all the 6 data
> values, then divide by 6 to get the 30 min avg. Or is there some other
> calculation.

It is the Mean average of the individual data points which make up the consolidated date point.

IE, for a 30min average, it is the sum of the 6 data values divided by 6.

As well as for native mode log files, this is also the case for RRDTool databases.

HTH

Steve

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