From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jordan Russell Subject: Re: MD RAID1 performance very different from non-RAID partition Date: Wed, 19 Sep 2007 00:28:47 -0500 Message-ID: <46F0B38F.8070901@quo.to> References: <46EB6D67.1000802@quo.to> <20070915070914.GA21515@teal.hq.k1024.org> <46EC2043.5010006@quo.to> <878x765kmy.fsf@informatik.uni-tuebingen.de> <46EEA413.8090706@quo.to> <20070918134438.GA1522@percy.comedia.it> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20070918134438.GA1522@percy.comedia.it> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Luca Berra wrote: > On Mon, Sep 17, 2007 at 10:58:11AM -0500, Jordan Russell wrote: >> Goswin von Brederlow wrote: >>> Compare the read ahead settings. >> I'm not sure what you mean. There's a per-mount read ahead setting? >> > > per device > > compare > blockdev --getra /dev/sda2 > and > blockdev --getra /dev/md0 Ah. 256 on /dev/sda2 with md0 stopped 256 on /dev/sda2 with md0 active 256 on /dev/md0 with md0 active -- Jordan Russell