[rrd-users] Invalid alpha parameter for forecasting
s.shipway at auckland.ac.nz
Wed Jan 15 23:01:53 CET 2014
> I'm trying to create a RRD with RRA for prediction, but each time I receive
> "Invalid alpha: must be between 0 and 1" error, no matter what value I set.
> This happens even when I try the examples from the documentation, for
> example this one, where alpha value is obviously between 0 and 1
> rrdtool create monitor.rrd --step 300 \
> DS:ifOutOctets:COUNTER:1800:0:4294967295 \
> RRA:AVERAGE:0.5:1:2016 \
I haven't tested this, but I believe the reason is that for HW forecasting, you must have a SET of HW RRAs.
Thus, just HWPREDICT on its own will not work. It needs to also have a SEASONAL, DEVSEASONAL, FAILURES, and DEVPREDICT to go with it. I had thought that rrdtool create would automatically create the additional RRAs but possibly that was a feature added later.
The above command line works for me (RRDtool 1.4.trunk) and you do not state which version of rrdtool you are using - possibly yours predates the autocreation or is simply an outdated buggy version.
I would try (1) explicitly creating all the RRAs in the HW set, or (2) upgrading RRDtool to the 1.4.latest version.
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