[mrtg] Re: 95th percentile?

[Brian Pavane]

I don't think the 95th percentile information really needs to be graphed.
Meerly a program that could pull the readings every 5 minutes from a piece
of equipment (say... a cisco), and then via cron at the end of the month
spit out a report would be sufficient.  This type of program doesn't need
to be tied to MRTG, however, being that MRTG is already pulling this data,
it would be best to find a way to reuse what MRTG pulls. 

On Fri, 24 Sep 1999, George D. Nincehelser wrote:

> 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
> 
> > -----Original Message-----
> > From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
> > Behalf Of Pete Templin
> > Sent: Friday, September 24, 1999 10:04 AM
> > To: David C Prall
> > Cc: mrtg at list.ee.ethz.ch
> > Subject: [mrtg] Re: 95th percentile?
> >
> >
> >
> > On Fri, 24 Sep 1999, David C Prall wrote:
> >
> > > What exactly are you looking for. I just use the WithPeak[]: wmy option.
> > > This shows the high along with the averages. Giving you four lines
> > > rather then two.
> > >
> > > At some point there was a patch for doing this, but at somepoint I
> > > believe it got converted into the WithPeak option. I have only been
> > > using MRTG for 6 months where I have actually looked beyond the standard
> > > default configmaker script. And at that point WithPeak was implemented,
> > > so I used it.
> >
> > 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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> >
> >
> 
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> 


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