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Date:	Sat, 4 Aug 2007 07:44:48 +0400
From:	"Manu Abraham" <>
To:	"Dave Dillow" <>
Cc:	"Evgeniy Polyakov" <>,,,
Subject: Re: Distributed storage.

On 8/4/07, Dave Dillow <> wrote:
> 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.

We don't use the code in the driver straight away [2] (in the case
that i mentioned), since that happens in the hardware (demodulator
chip) [1], but we have an interface for selecting the code-rate [2]
(LDPC/BCH) for DVB-S2 and the new papers for DVB-T2 looks geared that
the base decision is to use LDPC.

Though i now see a patent application for it [3]. Not sure whether it
is a registered patent, i am under an agreement of Non-Disclosure with
STM. Will ask the relevant person there, whether they have it
registered. (Most probably they may have it registered).

There are a few people from STM on LK, if not they can possibly
confirm whether the patent is regsitered or not.



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