From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Robinson Subject: Re: raid1 - optimization Date: Thu, 03 Feb 2011 14:56:49 +0000 Message-ID: <4D4AC231.8010900@anonymous.org.uk> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Roberto Spadim Cc: Linux-RAID List-Id: linux-raid.ids On 03/02/2011 14:37, Roberto Spadim wrote: > hi guys, i another thread i read about SNIA DDF Technical Position v2.0 > could we implement RAID-1E, for sequencial/random read speedup? > http://www.snia.org/tech_activities/standards/curr_standards/ddf/SNIA_DDF_Technical_Position_v2.0.pdf > after that, could we implement some tweaks on read balance (there's > another thread just for it) Those RAID-1E layouts look to me like what's implemented in md RAID as RAID-10 with near and offset layouts. As discussed frequently here, md RAID-10 also has a far layout which can provide slightly faster than RAID-0 throughput for sequential reading with slightly slower than RAID-1 throughput for sequential writing. Please see some of the benchmarks that have also been referred to on this list in the last couple of days. Cheers, John.