From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60146) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ashiU-0001oQ-19 for qemu-devel@nongnu.org; Tue, 19 Apr 2016 22:18:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ashiQ-0004aw-Oy for qemu-devel@nongnu.org; Tue, 19 Apr 2016 22:18:09 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59980) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ashiQ-0004ar-KA for qemu-devel@nongnu.org; Tue, 19 Apr 2016 22:18:06 -0400 Date: Wed, 20 Apr 2016 10:11:01 +0800 From: Fam Zheng Message-ID: <20160420021101.GC8684@ad-mail.usersys.redhat.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: Re: [Qemu-devel] I/O errors reported to guest for raw-image-file backed /dev/vda - but host sees no I/O errors List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Lutz Vieweg Cc: qemu-devel@nongnu.org On Tue, 04/19 19:47, Lutz Vieweg wrote: > The guest drive parameters are: > > -drive "file=image.raw,if=virtio,format=raw,media=disk,cache=unsafe,werror=report,rerror=report" Given this implies aio=threads... > Can you provide any hint on how to pursue the cause of these errors? > (I thought about using "strace -f -p ..." on qemu, but I don't > know what exactly to look for in the output - some failed "pwrite()" > to the image file?) ... yes, this should work. Fam