Date: Mon, 8 Nov 2010 21:44:29 +0100 From: "C. P. Ghost" <cpghost@cordula.ws> To: Roland Smith <rsmith@xs4all.nl> Cc: "Svein Skogen \(Listmail account\)" <svein-listmail@stillbilde.net>, freebsd-questions@freebsd.org Subject: Re: ZFS License and Future Message-ID: <AANLkTikcCFr4GttjNrq9Kxxz1pyZbPc82BsJ6a3siw5t@mail.gmail.com> In-Reply-To: <20101108183821.GA48373@slackbox.erewhon.net> References: <AANLkTi=dKatHYLFhC35VTT4fCAKgYLKEri2yVCPtSv7g@mail.gmail.com> <AANLkTinxLcrRoB6b2AcTrxHLqRCkyoWUhU=EmuvzEZQ8@mail.gmail.com> <20101106203016.GB13095@guilt.hydra> <20101106213836.GA77198@slackbox.erewhon.net> <AANLkTi=7MhvRTLP1NzGaHQFsV=FU8QDn5K73EmLPZH2k@mail.gmail.com> <4CD8194D.7080208@qeng-ho.org> <4CD82081.50309@stillbilde.net> <20101108183821.GA48373@slackbox.erewhon.net>
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On Mon, Nov 8, 2010 at 7:38 PM, Roland Smith <rsmith@xs4all.nl> wrote: > On Mon, Nov 08, 2010 at 05:08:33PM +0100, Svein Skogen (Listmail account) wrote: >> But it's still not capable of true forward-error-correction. If we are >> to embark upon creating a new solution, using something that is cheap >> for "normal cases" but can still be used (albeit more expensively) for >> error recovery would (imho) be better. Even if that means we get less >> net storage out of the gross pool (it could perhaps be configurable?) > > I'm not sure what you mean by "true forward-error-correction". But if you want > to make _really sure_ that a spinning disk hasn't mangled the data you should: Maybe something like Reed-Solomon ECC in different blocks. Should a data block go bad, it could be rebuilt on-the-fly from those ECC blocks: http://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction http://www.eccpage.com/ -cpghost. -- Cordula's Web. http://www.cordula.ws/
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