I have done this.  

It is really called 95th Percentile

The psudocode is to
rrdtool fetch all the data for the past 30 days.
figure out how many data points you have
pop off the top 5%
pop off the top# and there you go.  that is your 95th Percentile.

David

> -----Original Message-----
> From: Geert van der Ploeg [mailto:[EMAIL PROTECTED]
> Sent: Thursday, February 14, 2002 8:46 AM
> To: [email protected]
> Subject: [rrd-users] Calculating a 5%-rule
> 
> 
> 
> Hi all,
> 
> I'm implementing a sort of bandwidth-usage billing system, 
> using RRDtool.
> 
> <short mode>
> How to calculate what value is the highest, after ignoring 
> the highest 5% ?
> </short mode>
> 

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