[mrtg] Re: 95th percentile?

[George D. Nincehelser]

That's exactly what I've been looking for.

I assume that there is a way an external script can gather the data and
calculate the 95th percentile,  then pass that info in some way to MRTG so
it can be graphed?

I'm unclear as to the best way to graph the 95th percentile data.  I'm
thinking that a simple straight line across the graph would be sufficient
for billing purposes, but a trending line might look cool.  I imagine the
line would best be reset at the end of each billing period.

Thoughts?
George

> Most folks looking for 95th percentile want to be able to calculate the
> 95th percentile of all of the data over a given time period (usually a
> month).  MRTG only keeps its five minutes numbers for about two days, and
> then it only stores averaged averages.  It's impossible to recreate the
> true 95th percentile five minute average using reaveraged numbers; the
> peaks merely show the highest five minute peak across a two hour period.
> There's no way to determine how many five minute samples were that high.
>
> Some people have written scripts that archive a day's worth of five-minute
> samples each day, and then crank through that unaveraged data at the end
> of the month.  The few folks I've talked to about this usually wrote it on
> company time, and weren't permitted to release their script.  It's
> actually not that hard; the challenge is making sure that it scales well
> (or can be reengineered to scale).
>
> Pete
>
> --
> Peter J. Templin, Jr., CCNA
> Systems and Networks Administrator
>
> On-Line Internet Services - URDirect.net
> A division of Global On-Line Computers
> 2414 Babcock Rd. Suite 106		templin at urdirect.net
> San Antonio, TX 78229			(210)692-9911
>
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