From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KOpL1-0000iq-7b for qemu-devel@nongnu.org; Fri, 01 Aug 2008 03:46:11 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KOpL0-0000hE-Aa for qemu-devel@nongnu.org; Fri, 01 Aug 2008 03:46:10 -0400 Received: from [199.232.76.173] (port=54108 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KOpKz-0000gh-U0 for qemu-devel@nongnu.org; Fri, 01 Aug 2008 03:46:09 -0400 Received: from mail2.shareable.org ([80.68.89.115]:47295) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1KOpKz-0004qH-Ur for qemu-devel@nongnu.org; Fri, 01 Aug 2008 03:46:10 -0400 Received: from jamie by mail2.shareable.org with local (Exim 4.63) (envelope-from ) id 1KOpKx-00039f-Vm for qemu-devel@nongnu.org; Fri, 01 Aug 2008 08:46:08 +0100 Date: Fri, 1 Aug 2008 08:46:07 +0100 From: Jamie Lokier Subject: Re: [Qemu-devel] PATCH: Control over drive open modes for backing file Message-ID: <20080801074607.GA12019@shareable.org> References: <20080731113120.GJ23888@redhat.com> <489203C9.1040607@codemonkey.ws> <20080731185956.GA26755@shareable.org> <48921481.7010606@codemonkey.ws> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <48921481.7010606@codemonkey.ws> 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 Anthony Liguori wrote: > >Can I arbitrarily branch off different snapshots within a single qcow2 > >file? Can I delete the 'base' snapshots safely? Most important: what > >happens if I have snapshots in a qcow2 file which has a base file, and > >I type 'commit'? Does it corrupt all the snapshots, effectively? > > snapshots are linear, not branching. And they are only every > saved/loaded from the highest level qcow2 file. So if I understand that right, the 'commit' command (to write to the base image) _will_ corrupt all the snapshots since they depend on the base image and it just changed?? -- Jamie