North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: What does 95th %tile mean?
[ On Friday, April 20, 2001 at 00:52:39 (-0400), Charles Sprickman wrote: ] > Subject: RE: What does 95th %tile mean? > > On Thu, 19 Apr 2001, Greg A. Woods wrote: > > > Neither MRTG nor Cricket (nor anything with RRDtool or anything similar > > underlying it), in their standard released form, are truly suitable for > > accounting purposes since they both can introduce additional averaging > > errors. You need to keep all of the original sample data. > > This actually works pretty well: > > http://www.seanadams.com/95/ If you read that page carefully you'll note that he's using a modified version of MRTG that doesn't average its samples. As it says: This is a patch to add 95th percentile metering to MRTG. This is not as simple a feature as one might think. MRTG normally saves only one day worth of 5-minute samples. It is not possible to accurately calculate the 95th percentile without having all of the samples for a one month period. In order to calculate the 95th percentile for a 30-day period, it is necessary to save an entire 30 days worth of the 5-minute samples. MRTG does not do that by default, nor does Cricket, nor will any tool using RRDtool as an underlying database. > There was a very similar discussion just weeks ago on the datacenter > mailinglist as well, you all might want to peek at the archives... Perhaps you should look again at who posted to that discussion.... :-) -- Greg A. Woods +1 416 218-0098 VE3TCP <[email protected]> <[email protected]> Planix, Inc. <[email protected]>; Secrets of the Weird <[email protected]>
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