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Date:	Fri, 03 Aug 2007 22:51:08 -0400
From:	Dave Dillow <>
To:	Manu Abraham <>
Cc:	Evgeniy Polyakov <>,,,
Subject: Re: Distributed storage.

On Fri, 2007-08-03 at 09:04 +0400, Manu Abraham wrote:
> On 7/31/07, Evgeniy Polyakov <> wrote:
> > TODO list currently includes following main items:
> >     * redundancy algorithm (drop me a request of your own, but it is highly
> >         unlikley that Reed-Solomon based will ever be used - it is too slow
> >         for distributed RAID, I consider WEAVER codes)
> LDPC codes[1][2] have been replacing Turbo code[3] with regards to
> communication links and we have been seeing that transition. (maybe
> helpful, came to mind seeing the mention of Turbo code) Don't know how
> weaver compares to LDPC, though found some comparisons [4][5] But
> looking at fault tolerance figures, i guess Weaver is much better.
> [1]
> [2]
> [3]
> [4]$File/rj10391.pdf
> [5]

Searching Google for Dr. Plank's work at the University of TN turns up
some analysis of using LDPC codes in storage systems.

Patents are an issue to watch out for around the use of Tornado/Raptor
codes. I've not researched it, but I believe there be dragons there.
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