From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LRZNw-0005OG-Ni for qemu-devel@nongnu.org; Mon, 26 Jan 2009 16:52:48 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LRZNu-0005Lu-WF for qemu-devel@nongnu.org; Mon, 26 Jan 2009 16:52:48 -0500 Received: from [199.232.76.173] (port=60833 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LRZNu-0005Li-SP for qemu-devel@nongnu.org; Mon, 26 Jan 2009 16:52:46 -0500 Received: from mail2.shareable.org ([80.68.89.115]:57480) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1LRZNu-0002Zr-F4 for qemu-devel@nongnu.org; Mon, 26 Jan 2009 16:52:46 -0500 Date: Mon, 26 Jan 2009 21:52:39 +0000 From: Jamie Lokier Subject: Re: [Qemu-devel] [PATCH 0/7] block-vpc: Improve support for VHD images Message-ID: <20090126215239.GA9296@shareable.org> References: <1232989168-27759-1-git-send-email-kwolf@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1232989168-27759-1-git-send-email-kwolf@suse.de> Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf Kevin Wolf wrote: > This patch series improves the support for Virtual PC images. Until > now, support for this image format is read-only and broken for large > images. With these patches applied, you can create and write to VHD > Dynamic Disks and some bugs in the read support are fixed. They have > been tested with qemu-img convert from and to raw images and a > successful openSUSE installation on a fresh VHD image. Ooh, I look forward to trying these patches. :-) I have some VHD image of Windows which always resulted in lots of scandisk errors when Windows booted from it (using -snapshot), and the same when converted to a QCOW2 file by qemu-img. The only thing that worked was using MS VirtualPC's convert-to-raw facility from the disk image wized, then I could use that raw file with QEMU. That proved qemu-img was getting it wrong. (By the way, VPC took *ridiculously* long - about 8 hours for an 80GB sparse image. VirtualPC appears to use unbuffered writes (equivalent to O_DIRECT) at least when over SMB, but they are small writes and not overlapped, so it trickles along very slowly). So I look forward to trying these patches on that image, which I don't use know but kept for this very purpose, and seeing if it's fixed the errors. -- Jamie