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List:       mrtg
Subject:    Re: [mrtg] how the 30 min avg is calculated and stored in log file
From:       Steve Shipway <s.shipway () auckland ! ac ! nz>
Date:       2009-10-26 21:15:01
Message-ID: 6B587E8C999646469B54486AF21958460CB9487DC1 () UXCHANGE7-1 ! UoA ! auckland ! ac ! nz
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>  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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