From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37322) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFodG-0003X5-2R for qemu-devel@nongnu.org; Mon, 26 Jan 2015 13:43:31 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YFodC-0004SK-2C for qemu-devel@nongnu.org; Mon, 26 Jan 2015 13:43:30 -0500 Received: from mx1.redhat.com ([209.132.183.28]:37296) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFodB-0004SA-OP for qemu-devel@nongnu.org; Mon, 26 Jan 2015 13:43:25 -0500 Message-ID: <54C68AC7.7000902@redhat.com> Date: Mon, 26 Jan 2015 11:43:19 -0700 From: Eric Blake MIME-Version: 1.0 References: <54A5EB53.4010606@netcologne.de> <54C57997.9010401@netcologne.de> In-Reply-To: <54C57997.9010401@netcologne.de> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="fBw3QgcDlXrvQhjsRvbGViVvUxQWTWDig" Subject: Re: [Qemu-devel] Fwd: Fwd: [Qemu-discuss] wrong command on snapshot wiki List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: vrms@netcologne.de, qemu-devel@nongnu.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --fBw3QgcDlXrvQhjsRvbGViVvUxQWTWDig Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 01/25/2015 04:17 PM, vrms@netcologne.de wrote: > I am not 100% sure whether this is the right place to raise this issue.= > Maybe you can forward this to right person > | > I have the feeling this wikipage >>> > http://wiki.qemu.org/Documentation/CreateSnapshot is wrong. I think the= > decription and the posted command for creating snapshots [||qemu-img > create -f qcow2 -b centos-cleaninstall.img snapshot.img|] |is actually > describing copy-on-write (or overlay) images. And I think this is not > the same thing That is the procedure for creating external snapshots (the original file is the snapshot, and the newly created overlay stores the delta). >=20 > |||As far as I know such a command would creat a copy-on-write image an= d > not a snapshot|. On the german debianforum.de I got another suggestion > to vreate snaptshots which I have not tested yet, but sounds more likel= y > to be correct to me >=20 > qemu-img snapshot -c [snapshot_name] [base_name] That is the procedure fore creating internal snapshots (a single file holds both the snapshot and all changes since the snapshot). Both methods have their benefits and drawbacks, but right now, there is more work being done with external snapshots than with internal snapshots= =2E --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --fBw3QgcDlXrvQhjsRvbGViVvUxQWTWDig 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 Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJUxorHAAoJEKeha0olJ0NqeFYIAKuex+Fx6ywD/1L/QQkfKW+v YdSQOHGfx7PQkg5JzDZd5R6DXFPEYeDO4u3NQeQ0TfHmXl7WN38AFxT7femBpumF aK6OqZT/ms0pgGylVTlFs21ttjYjXlJapxjEPg4MKFgfZpFKje3AS6T0uZ7MnLm/ qbQVhA0csCx/RLJNbQsnAzyjNcOkHIUmPXn/WsBOJ0U6UcCoS//TYD7r6H8aTuDv Of3PHVZ5mRWxT/s73CC1wh/P1xnKHoCtWdRvwnX6IK/iSVTt/koLRZT63aa6dYVD ChfHLgW599srYNqPrlNr2tLdjnhCVsctvpvbHyK7npxmlISaltjWnATIBCiKHo4= =PI0v -----END PGP SIGNATURE----- --fBw3QgcDlXrvQhjsRvbGViVvUxQWTWDig--