> 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 \ > RRA:HWPREDICT:1440:0.1:0.0035:288
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and you do not state which version of rrdtool you are using - possibly yours predates the autocreation or is simply an outdated buggy version.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. Steve Steve Shipway ITS Unix Services Design Lead University of Auckland, New Zealand Floor 1, 58 Symonds Street, Auckland Phone: +64 (0)9 3737599 ext 86487 DDI: +64 (0)9 923 6487 Mobile: +64 (0)21 753 189 Email: s.ship...@auckland.ac.nz Please consider the environment before printing this e-mail : 打印本邮件，将减少一棵树存活的机会
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