From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keld =?iso-8859-1?Q?J=F8rn?= Simonsen Subject: performance problems with raid10,f2 Date: Sat, 15 Mar 2008 00:11:51 +0100 Message-ID: <20080314231151.GA14568@rap.rap.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hi I have a 4 drive array with 1 TB Hitachi disks, formatted as raid10,f2 I had some strange observations: 1. while resyncing I could get the raid to give me about 320 MB/s in sequential read, which was good. After resync had been done, and with all 4 drives active, I only get 115 MB/s. 2. while resyncing, the IO rate on each disk is about 27 MB/s - and the rate of each sdisk is about 82 MB/s. Why is this? best regards keld