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[Dennis <question208654@xxxxxxxxxxxxxxxxxxxxx>]

New question #208654 on Graphite:
https://answers.launchpad.net/graphite/+question/208654

Hi,

I'm trying to (ab)use graphite to draw graphs on IP network data usage (BGP peering/transit if you care).
I have the metrics in the system and i can draw all sorts of graphs without much trouble, but i can't figure out the nPercentile function.  As you may or may not know, in purchasing transit traffic, the 95th percentile calculation is all that counts... just to make sure i am on the same page as ow the graphite percentile works, this is what i'm talking about: http://en.wikipedia.org/wiki/Burstable_billing.

As you can see on this image: http://www.ipaddr.nl/KPN.png i am capable of drawing the metric "acct_in.KPN_Transit.0-bytes" as such, however if i apply the nPercentile function as such:  "nPercentile(acct_in.KPN_Transit.0-bytes,95)" the graph doesn't draw (broken image icon...).

Logging says:
/opt/graphite/storage/log/webapp$ tail -f *

==> access.log <==
x.x.x.x - - [15/Sep/2012:11:46:44 +0200] "GET /render/?_salt=1347702416.535&width=894&height=403&target=nPercentile(acct_in.KPN_Transit.0-bytes%2C95) HTTP/1.1" 500 905

Any clues?

Kind regards,

Dennis

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