[rrd-users] Invalid alpha parameter for forecasting

geri geri.stoycheva at gmail.com
Thu Jan 16 10:04:31 CET 2014

Thanks for the quick replay, S Shipway,  but I don't think not having the
other prediction RRA is the reason for my problem. First, when you create
HWPREDICT RRA without /rra-num/ parameter (and this is the case here), the
other RRAs will "implicitly be created with default parameter values".
Besides I tried to create a lot of other RRDs, with different combinations
of RRAs, for example I tried this one (again an example from the

rrdtool create monitor.rrd --step 300 \
   DS:ifOutOctets:COUNTER:1800:0:4294967295 \
   RRA:AVERAGE:0.5:1:2016 \
   RRA:HWPREDICT:1440:0.1:0.0035:288:3 \
   RRA:SEASONAL:288:0.1:2 \
   RRA:DEVPREDICT:1440:5 \
   RRA:DEVSEASONAL:288:0.1:2 \

I had the same problem each time I tried to create HWPREDICT (or
RRA:MHWPREDICT for that matter). I gave this example, because it is directly
taken from the examples in the documentation and I really can't figure out
why is it not working.

About the RRDTool version: sorry that I did not mentioned it. I'm using
1.4.7, which I believe is the last stable release. 

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