From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:40723) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UVMTo-0003FQ-Ow for qemu-devel@nongnu.org; Thu, 25 Apr 2013 09:44:58 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UVMTj-0004NC-V0 for qemu-devel@nongnu.org; Thu, 25 Apr 2013 09:44:56 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37126) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UVMTj-0004N1-N2 for qemu-devel@nongnu.org; Thu, 25 Apr 2013 09:44:51 -0400 Message-ID: <5179333D.1040501@redhat.com> Date: Thu, 25 Apr 2013 07:44:29 -0600 From: Eric Blake MIME-Version: 1.0 References: <1366886263-21263-1-git-send-email-morita.kazutaka@lab.ntt.co.jp> In-Reply-To: <1366886263-21263-1-git-send-email-morita.kazutaka@lab.ntt.co.jp> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="----enig2OPNJXOQVWHHUXPEMQEMR" Subject: Re: [Qemu-devel] [PATCH 0/3] sheepdog: support online snapshot from qemu-img List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: MORITA Kazutaka Cc: kwolf@redhat.com, sheepdog@lists.wpkg.org, qemu-devel@nongnu.org, stefanha@redhat.com This is an OpenPGP/MIME signed message (RFC 4880 and 3156) ------enig2OPNJXOQVWHHUXPEMQEMR Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 04/25/2013 04:37 AM, MORITA Kazutaka wrote: > Currently, we can take sheepdog snapshots of running VMs only from the > qemu monitor. This series allows taking online snapshots from > qemu-img. Is that even safe? We specifically recommend that users NOT use qemu-img on any image that is in-use by a qemu process, and instead only use qemu monitor commands; since qemu-img may see inconsistent state, and worse, any writes that qemu-img do may cause qemu to see inconsistent state and cause corruption to the running guest. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org ------enig2OPNJXOQVWHHUXPEMQEMR Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (GNU/Linux) Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJReTM9AAoJEKeha0olJ0NqfdEH/0QO8J8UB12x7ULE3lMu1Ze1 ps91TPV2A8r1PVgl56n7D2v1YT+Nu4bV00potGDomtEPjOqeNxm7qM7+YdAFu8lv 7inyrEUKUsQhVLzNVd6b/6/uSasAbHvEZSrhdewmgNoxXi2OCs7JxRIi+yJGksJ8 EF48XEOFaqARKhfohvDIlYKYJLRk8R+xqzwc0Z4VWHEXVkG8GjxOqGHzGxTR0bOU Fcya38QeI8U763KXYYN1jrlqoxJ8WvM4jE4BXx7uJJzT0vp53Bb/BSUjWjebL2cx 9kKtVl7a/JYdld8xZEEHcRsju4yVyby0gZAiWVjxkMPmWE1+LGx5IFOMQ/fn4Ww= =OMWL -----END PGP SIGNATURE----- ------enig2OPNJXOQVWHHUXPEMQEMR--