From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NwabS-0000sJ-TS for qemu-devel@nongnu.org; Tue, 30 Mar 2010 08:31:30 -0400 Received: from [140.186.70.92] (port=44367 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NwabR-0000po-DP for qemu-devel@nongnu.org; Tue, 30 Mar 2010 08:31:30 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1NwabI-0008Oa-NX for qemu-devel@nongnu.org; Tue, 30 Mar 2010 08:31:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57044) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1NwabI-0008OS-Fs for qemu-devel@nongnu.org; Tue, 30 Mar 2010 08:31:20 -0400 Message-ID: <4BB1EEF4.3070407@redhat.com> Date: Tue, 30 Mar 2010 14:30:44 +0200 From: Kevin Wolf MIME-Version: 1.0 References: <445AFA0A-43C1-4F8A-929E-EE3735E93999@suse.de> In-Reply-To: <445AFA0A-43C1-4F8A-929E-EE3735E93999@suse.de> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] Re: qemu-img help missing backing file List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Alexander Graf Cc: qemu-devel Developers Am 30.03.2010 14:22, schrieb Alexander Graf: > Howdy, > > I just wanted to create a backed qcow2 image and was irritated by qemu-img not showing me the correct command line option. It's just missing from the list: [...] > Is this intentional? The actual command still works: > >> agraf@s390t27:~/git/qemu> qemu-img-kvm create -f qcow2 -b /media/studio/images/SUSE/s390/sles11.raw /dev/shm/sles11-zipl.qcow2 >> Formatting '/dev/shm/sles11-zipl.qcow2', fmt=qcow2 size=21474836480 backing_file='/media/studio/images/SUSE/s390/sles11.raw' encryption=off cluster_size=0 -b still works to maintain compatibility with older versions. The documented way is -o backing_file=foo (the qemu-img output you quote even contains this option). Kevin