[rrd-users] Re: percentile calculations

[Alex van den Bogaerdt]

On Tue, Sep 05, 2006 at 06:04:38PM -0400, Dan Cech wrote:

> I did manage to make this work for a single RRD, by using code like:
> 
> DEF:rawin=$rrdfile.rrd:in:LAST:end=$now
> VDEF:raw95in=rawin,95,PERCENT
> CDEF:raw295in=myin,POP,raw95in,8,*
> VDEF:95in=raw295in,MAXIMUM

take one value out of range rawin, place it in raw95in
raw95in is not a range, it is a number.

create raw295in, a time series of data, rate 8 times raw95in.
Each entry is the same rate.

Take the maximum of raw295in (average, minimum or last should
also work, no?)

Wouldn't this ...

DEF:rawin=$rrdfile.rrd:in:LAST:end=$now
CDEF:bytes=rawin,8,*
VDEF:95in=bytes,95,PERCENT

... produce the same number?  Am I missing something?


> While this does appear to work, because it relies on access to the raw
> DEF it cannot be used with data that is aggregated across multiple rrds.

VDEF can also work on CDEF data.

-- 
Alex van den Bogaerdt
http://www.vandenbogaerdt.nl/rrdtool/

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