Hi! I have used rrdtool for a while and has since the beginning been wondering about why the consolidation function (CF) is set per archive (RRA) and not per data source (DS). I have many times been in a situation where I want to store related parameters in the same RRD but I want to have different consolidation done on them.
An example could be a weather data logger. Every hour I get the min/average/max temperature, amount of rain and the average wind direction and speed. All parameters should use the average consolidation except for the min/max temperature, where the storing the "average min" and "average max" doesn't make much sense. And while I'm at it... I'm missing a consolidation function here. I would like to consolidate the amount of rain with a "SUM" function, since that is what I'm actually measuring at the weather station. I have found a workaround for this by using AVERAGE consolidation and multiplying with the step size when graphing. It works but it feels like a bad hack. I might be able to create a patch that adds a SUM consolidation function if there is a chance it will be included in rrdtool, but I don't have a good proposal how to solve the consolidation per data source yet. Maybe there is a reason why different data sources can not have their own consolidation function within the same archive that I don't see. Regards Fredrik
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