[rrd-users] Re: Average calculations for working hours only, but 7x24 stored

Einar Indridason einari at f-prot.com
Sat Nov 12 15:59:06 MET 2005

On Sat, Nov 12, 2005 at 10:03:46AM +0100, Ralf Kruedewagen wrote:
> Good morning,


> 2) Is there any tricky RPN expression to do that, maybe embedded in a small 
> script for matching day of a week and hours to UNIX timestamps ?
> Advantage: Filter expression can be changed later. Interactive calculations 
> possible (web form). And, I could also filter out time ranges which are 
> defined as "scheduled downtime".
> From RPN tutorial I know that it is possible to define something for a single 
> timeframe. But for a monthly average I need to filter out a lot of "unwanted" 
> time ranges. With SQL this would be no problem, but with RRDtool I have my 
> problems.

Well... one way of looking at it, would be to say... "hmm... Let's keep
the RRD expression as simple as I can make it", and instead use some kind
of a wrapper (for example, in perl or perl+SQL) to dynamically write the propper
CDEFs for you?
(Left as an excercise for the reader :-)

EinarI at f-prot.com

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