[rrd-developers] How to create a new Data Type and Consolidation Function?
s.shipway at auckland.ac.nz
Fri Feb 4 05:32:38 CET 2011
> We need to graph a COUNTER (as input) but for output, instead of a rate of
> change, we simply need the difference against the previous reading (instead
> of difference against the previous reading divided by the polling period in
> seconds, as the existing COUNTER data type of RRDTool).
I think you can achieve this by using a normal COUNTER and then using AVG*interval
> Also for Consolidation, we would like to simply add all the values, so a new
> Consolidation Function is needed as well (in addition to the existing
> AVERAGE, MIN, MAX, LAST).
Again, you can probably get this by using SUM( AVG * interval )
This is how Routers2 gives the total traffic count for the last 24 hours -- it asks for a sum over the last 24*12 cdp AVG values, multiplied by 300 (since the interval is 5min). A bit of maths will show you that this results in the correct total value for the period.
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