From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Manu Abraham" Subject: Re: Distributed storage. Date: Fri, 3 Aug 2007 09:04:51 +0400 Message-ID: <1a297b360708022204u4fc7603pb6baebe2bdf28618@mail.gmail.com> References: <20070731171347.GA14267@2ka.mipt.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org To: "Evgeniy Polyakov" Return-path: Received: from rv-out-0910.google.com ([209.85.198.190]:42078 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752596AbXHCFEw (ORCPT ); Fri, 3 Aug 2007 01:04:52 -0400 Received: by rv-out-0910.google.com with SMTP id k20so588529rvb for ; Thu, 02 Aug 2007 22:04:52 -0700 (PDT) In-Reply-To: <20070731171347.GA14267@2ka.mipt.ru> Content-Disposition: inline Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org 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] http://www.ldpc-codes.com/ [2] http://portal.acm.org/citation.cfm?id=1240497 [3] http://en.wikipedia.org/wiki/Turbo_code [4] http://domino.research.ibm.com/library/cyberdig.nsf/papers/BD559022A190D41C85257212006CEC11/$File/rj10391.pdf [5] http://hplabs.hp.com/personal/Jay_Wylie/publications/wylie_dsn2007.pdf