From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42339) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YAkN5-00016W-88 for qemu-devel@nongnu.org; Mon, 12 Jan 2015 14:09:52 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YAkN0-00044x-Ix for qemu-devel@nongnu.org; Mon, 12 Jan 2015 14:09:51 -0500 Received: from mail-wi0-x229.google.com ([2a00:1450:400c:c05::229]:62655) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YAkN0-00044q-CX for qemu-devel@nongnu.org; Mon, 12 Jan 2015 14:09:46 -0500 Received: by mail-wi0-f169.google.com with SMTP id n3so721686wiv.0 for ; Mon, 12 Jan 2015 11:09:45 -0800 (PST) Sender: Paolo Bonzini Message-ID: <54B41BE7.1080909@redhat.com> Date: Mon, 12 Jan 2015 20:09:27 +0100 From: Paolo Bonzini MIME-Version: 1.0 References: <1418307457-25996-1-git-send-email-vsementsov@parallels.com> <1418307457-25996-10-git-send-email-vsementsov@parallels.com> <54B3FACA.7060800@redhat.com> <54B404D9.6060203@redhat.com> In-Reply-To: <54B404D9.6060203@redhat.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 9/9] block-migration: add named dirty bitmaps migration List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: John Snow , Vladimir Sementsov-Ogievskiy , qemu-devel@nongnu.org Cc: kwolf@redhat.com, den@openvz.org, stefanha@redhat.com On 12/01/2015 18:31, John Snow wrote: >> How do you track which parts of the disk have been acted upon (e.g. >> mirrored in the case of the drive-mirror command), so that they have >> become 0? > > Hm... so your question here is, "What happens if the named bitmap you > are transferring gets reset to 0 during migration? Will anybody track > this change?" > > As far as I know, the only "consumer" of _named_ BdrvDirtyBitmaps is > block/backup.c, and we do not support it for mirror (yet?) Right. > So can a block-backup job be running WHILE we migrate? I think so. Paolo