From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Friesen Subject: getting I/O errors in super_written()...any ideas what would cause this? Date: Wed, 28 Nov 2012 11:52:17 -0600 Message-ID: <50B64F51.6000402@genband.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: Neil Brown , linux-raid@vger.kernel.org, Jens Axboe List-Id: linux-raid.ids Hi, I'm running 2.6.27 with LVM over software RAID 1 over a pair of SAS disks. Recently we started seeing messages of the following pattern: Nov 28 08:57:10 kernel: end_request: I/O error, dev sda, sector 1758169523 Nov 28 08:57:10 kernel: md: super_written gets error=-5, uptodate=0 Nov 28 08:57:10 kernel: raid1: Disk failure on sda2, disabling device. Nov 28 08:57:10 kernel: raid1: Operation continuing on 1 devices. We're working through our changes to figure out what might have triggered it, but it seems likely the root cause lies in the core code. We're assuming it's a software issue since it's reproducible on multiple new-ish systems, although so far we've only tried it on systems with one particular configuration--we're planning on trying it with different disks just to be sure. For what it's worth, we've seen the problems with disk write cache enabled and disabled. Anyone have any ideas, or pointers as to what I should look at? Thanks, Chris -- Chris Friesen Software Designer 3500 Carling Avenue Ottawa, Ontario K2H 8E9 www.genband.com