Subject: RE: Aberrant behaviour -- any experience?
From: Stanislav Sinyagin (ssinyagin@yahoo.com)
Date: Tue May 21 2002 - 16:56:53 CDT
--- Jake Brutlag <jakeb@microsoft.com> wrote: > > I already reduced it to 2 failures in 30-minute window. > > You want to go the other direction; the default is 7 or more violations > in a window of 9 observations produces a failure. If you changed this to > something like 2 or more violations in a window of 6 observations, this > means that failures will occur more frequently (lower bar defines a > failure). If there is something in the documentation which suggests the > opposite, please let me know and I'll correct it. no, that was my own experimenting. I thought that it's not really interesting to know about a failure which happened half-hour ago. I knew there's a price for knowing it sooner, I didn't expect it to be that high... > > As far as I understood from the manual, aberrant-reset option > > does not re-apply the algorithm to the existing data, and I can see > the effect > > only few days later? > > The problem is that the data for the algorithm to 're-learn' is not > guaranteed to be available. In your case, you are preserving 2 weeks of > fine-resolution historical data. But often the fine-resolution data > (5-min averages) is discarded after a day or so in favor of consolidated > data, which can't be used. Well, anyway any available date is better to use. And the one tuning the settings might set the fine-resolution RRA to a higher size for the time of tuning. It's late evening here, I'll look into the sources with a fresh head and try to decide what's more worth implementing -- a perl script or a direct hack into the sources. Cheers, Stanislav __________________________________________________ Do You Yahoo!? LAUNCH - Your Yahoo! Music Experience http://launch.yahoo.com -- Help mailto:majordomo@net.doit.wisc.edu and say "help" in message body Unsubscribe mailto:majordomo@net.doit.wisc.edu and say "unsubscribe flowscan" in message body Archive http://net.doit.wisc.edu/~plonka/list/flowscan/archive/
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