From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keld Simonsen Subject: Re: Reed Solomon coding based Raid? Date: Sat, 28 Nov 2009 19:57:32 +0100 Message-ID: <20091128185732.GA15674@light.rap.dk> References: <4B113E90.50904@xs4all.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Return-path: Content-Disposition: inline In-Reply-To: <4B113E90.50904@xs4all.nl> Sender: linux-raid-owner@vger.kernel.org To: John Hendrikx Cc: linux-raid List-Id: linux-raid.ids On Sat, Nov 28, 2009 at 04:15:28PM +0100, John Hendrikx wrote: > I was wondering if there is support for a raid level where one can > choose the redundancy level. Raid 5 allows for one redundant drive, > Raid 6 for two, but there's no raid level that would support arbitrary > redundancy (even to the point of allowing one to add extra redundancy > later on, by simply putting spare drives to immediate use). > > I'm just a casual Software Raid user, and have been using Raid 6 for a > small 8 TB array for a few years now and I realize that there's quite > some CPU overhead involved for such redundancy, but for my purposes > speed is not a relevant concern (10 MB/sec is enough). Actually you can choose the number of copies in raid10, via the -n option. Best regards keld