[36788] in North American Network Operators' Group
RE: What does 95th %tile mean?
daemon@ATHENA.MIT.EDU (David Schwartz)
Fri Apr 20 02:27:39 2001
From: "David Schwartz" <davids@webmaster.com>
To: "North America Network Operators Group Mailing List" <nanog@merit.edu>
Date: Thu, 19 Apr 2001 23:25:21 -0700
Message-ID: <NCBBLIEPOCNJOAEKBEAKEEKPOHAA.davids@webmaster.com>
MIME-Version: 1.0
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: 7bit
In-Reply-To: <20010420061033.81462BE@proven.weird.com>
Errors-To: owner-nanog-outgoing@merit.edu
> 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:
No. The only change he makes the MRTG is to display the 95th percentile
values he computes.
> 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.
Right, so he has to make backups of MRTG's log file in order to have
sufficient history data.
> MRTG does not do that by default, nor does Cricket, nor will any tool
> using RRDtool as an underlying database.
MRTG does not do *what* by default?
DS
