From: Joe Landman <joe.landman@gmail.com>
To: David Brown <david.brown@hesbynett.no>
Cc: linux-raid@vger.kernel.org
Subject: Re: Triple-parity raid6
Date: Sat, 11 Jun 2011 13:14:38 -0400 [thread overview]
Message-ID: <4DF3A27E.8080806@gmail.com> (raw)
In-Reply-To: <it058n$1ju$1@dough.gmane.org>
A quick note of caution (and someone from Netapp, feel free to speak up).
Netapp has a patent on triple parity raid (c.f.
http://www.freepatentsonline.com/7640484.html). A quick look over this,
suggests that the major innovation is the layout and computation which
they simplified in a particular manner. That is, I don't think their
patent covers triple parity RAID in general, but does cover their
implementation, and the diagonal parity with anti-diagonal parity
(effectively counter propagating or orthogonalized parity).
I am not sure what this means from a coding sense, other than not to use
their techniques without a license to do so. If Netapp wants to grant
such a license, this would be good, but I suspect that it wouldn't be
quite as simple as this.
Just a note so that we don't encounter problems. I think its very
possible to avoid their IP, as it would somewhat hard to claim ownership
of the Galois Field math behind RAID calculations. They can (and do)
claim a particular implementation and algorithm.
[also not trying to open the patent on code wars here, just pointing out
the current situation ]
--
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics, Inc.
email: landman@scalableinformatics.com
web : http://scalableinformatics.com
http://scalableinformatics.com/sicluster
phone: +1 734 786 8423 x121
fax : +1 866 888 3112
cell : +1 734 612 4615
next prev parent reply other threads:[~2011-06-11 17:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-09 0:01 Triple-parity raid6 David Brown
2011-06-09 1:49 ` NeilBrown
2011-06-09 11:32 ` David Brown
2011-06-09 12:04 ` NeilBrown
2011-06-09 19:19 ` David Brown
2011-06-10 3:22 ` Namhyung Kim
2011-06-10 8:45 ` David Brown
2011-06-10 12:20 ` Christoph Dittmann
2011-06-10 14:28 ` David Brown
2011-06-11 10:13 ` Piergiorgio Sartor
2011-06-11 11:51 ` David Brown
2011-06-11 13:18 ` Piergiorgio Sartor
2011-06-11 14:53 ` David Brown
2011-06-11 15:05 ` Joe Landman
2011-06-11 16:31 ` David Brown
2011-06-11 16:57 ` Joe Landman
2011-06-12 9:05 ` David Brown
2011-06-11 17:14 ` Joe Landman [this message]
2011-06-11 18:05 ` David Brown
2011-06-10 9:03 ` David Brown
2011-06-10 13:56 ` Bill Davidsen
2011-06-09 22:42 ` David Brown
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