From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Robinson Subject: Re: Faster read performance DURING (?) resync on raid10 Date: Fri, 26 Sep 2008 09:03:44 +0100 Message-ID: <48DC9760.90905@anonymous.org.uk> References: <19666016.post@talk.nabble.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <19666016.post@talk.nabble.com> Sender: linux-raid-owner@vger.kernel.org To: Linux RAID List-Id: linux-raid.ids On 25/09/2008 10:27, sminded wrote: > The strange thing is that I can see a significant increase in read > performance (about 20%) when running the tests DURING the raid resync phase > directly after the raid creation Is it possible this is because the resync process has already read part of the disc into cache when your test starts, effectively poisioning the test results? Cheers, John.