From: Kevin Wolf <kwolf@redhat.com>
To: "Richard W.M. Jones" <rjones@redhat.com>
Cc: Max Reitz <mreitz@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
ehabkost@redhat.com, stefanha@redhat.com, qemu-devel@nongnu.org,
qemu-block@nongnu.org
Subject: Re: [Qemu-devel] storing machine data in qcow images?
Date: Mon, 28 May 2018 20:38:33 +0200 [thread overview]
Message-ID: <20180528183833.GJ4580@localhost.localdomain> (raw)
In-Reply-To: <20180528183058.GG2209@redhat.com>
Am 28.05.2018 um 20:30 hat Richard W.M. Jones geschrieben:
> On Mon, May 28, 2018 at 08:10:32PM +0200, Max Reitz wrote:
> > As someone who is just naive and doesn't see the big picture, I don't
> > see what's wrong with using a tar file that contains the image and
> > additional data.
>
> FWIW an OVA file is exactly this: an uncompressed tar file containing
> disk image(s) and metadata.
If we combine VM configuration and the disk image this way, I would
still want to directly use that combined thing without having to extract
its components first.
Just accessing the image file within a tar archive is possible and we
could write a block driver for that (I actually think we should do
this), but it restricts you because certain operations like resizing
aren't really possible in tar. Unfortunately, resizing is a really
common operation for non-raw image formats.
And if I think of a file format that can contain several different
things that can be individually resized etc., I end up with qcow2 in the
simple case or a full file system in the more complex case.
Kevin
next prev parent reply other threads:[~2018-05-28 18:38 UTC|newest]
Thread overview: 157+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-18 15:30 [Qemu-devel] storing machine data in qcow images? Michael S. Tsirkin
2018-05-18 16:49 ` Eduardo Habkost
2018-05-18 17:09 ` Daniel P. Berrangé
2018-05-18 17:41 ` Eduardo Habkost
2018-05-19 6:05 ` Markus Armbruster
2018-05-21 18:29 ` Eduardo Habkost
2018-05-21 18:44 ` Daniel P. Berrangé
2018-05-21 19:01 ` Eduardo Habkost
2018-05-23 11:19 ` Markus Armbruster
2018-05-23 12:13 ` Eduardo Habkost
2018-05-23 16:35 ` Markus Armbruster
2018-05-29 14:06 ` Dr. David Alan Gilbert
2018-06-05 21:58 ` Michal Suchánek
2018-05-21 20:18 ` Daniel P. Berrangé
2018-05-21 20:33 ` Eduardo Habkost
2018-05-24 9:58 ` Kashyap Chamarthy
2018-05-22 7:35 ` Gerd Hoffmann
2018-05-22 10:53 ` Eduardo Habkost
2018-05-22 14:19 ` Michael S. Tsirkin
2018-05-22 15:02 ` Kevin Wolf
2018-05-22 15:14 ` Eduardo Habkost
2018-05-23 2:12 ` Fam Zheng
2018-05-23 9:16 ` Kevin Wolf
2018-05-23 14:46 ` Michael S. Tsirkin
2018-05-24 11:17 ` Richard W.M. Jones
2018-05-29 14:03 ` Dr. David Alan Gilbert
2018-05-29 14:14 ` Eduardo Habkost
2018-05-29 14:51 ` Richard W.M. Jones
2018-05-29 15:31 ` Dr. David Alan Gilbert
2018-05-22 8:50 ` Philipp Hahn
2018-05-24 11:32 ` Richard W.M. Jones
2018-05-24 14:56 ` Michael S. Tsirkin
2018-05-24 15:08 ` Kevin Wolf
2018-05-24 15:19 ` Michael S. Tsirkin
2018-05-24 15:20 ` Richard W.M. Jones
2018-05-24 16:25 ` Markus Armbruster
2018-05-28 18:10 ` Max Reitz
2018-05-28 18:30 ` Richard W.M. Jones
2018-05-28 18:38 ` Kevin Wolf [this message]
2018-05-28 18:44 ` Max Reitz
2018-05-28 19:09 ` Kevin Wolf
2018-05-29 9:23 ` Max Reitz
2018-05-29 10:14 ` Kevin Wolf
2018-05-29 13:16 ` Eduardo Habkost
2018-05-28 21:20 ` Richard W.M. Jones
2018-05-28 21:25 ` Richard W.M. Jones
2018-05-29 6:44 ` Kevin Wolf
2018-05-29 10:14 ` Max Reitz
2018-06-05 9:21 ` Dr. David Alan Gilbert
2018-06-05 19:03 ` Eduardo Habkost
2018-06-05 19:47 ` Michael S. Tsirkin
2018-06-05 19:54 ` [Qemu-devel] [Qemu-block] " Eric Blake
2018-06-05 19:58 ` Richard W.M. Jones
2018-06-05 20:09 ` Eric Blake
2018-06-05 20:28 ` Michael S. Tsirkin
2018-06-05 20:46 ` Eric Blake
2018-06-05 21:26 ` Michael S. Tsirkin
2018-06-06 8:07 ` Dr. David Alan Gilbert
2018-06-06 6:23 ` Gerd Hoffmann
2018-06-05 20:06 ` Michael S. Tsirkin
2018-06-06 6:26 ` [Qemu-devel] " Gerd Hoffmann
2018-06-06 9:44 ` Dr. David Alan Gilbert
2018-06-06 13:35 ` Eduardo Habkost
2018-06-06 11:02 ` Max Reitz
2018-06-06 11:14 ` Dr. David Alan Gilbert
2018-06-06 11:26 ` Max Reitz
2018-06-06 12:00 ` Dr. David Alan Gilbert
2018-06-06 12:59 ` Max Reitz
2018-06-06 14:31 ` Dr. David Alan Gilbert
2018-06-06 14:37 ` Daniel P. Berrangé
2018-06-06 14:42 ` Dr. David Alan Gilbert
2018-06-06 14:51 ` Max Reitz
2018-06-06 15:05 ` Dr. David Alan Gilbert
2018-06-06 15:36 ` Eric Blake
2018-06-06 16:11 ` Michal Suchánek
2018-06-06 16:37 ` Eric Blake
2018-06-06 16:32 ` Daniel P. Berrangé
2018-06-06 16:36 ` Dr. David Alan Gilbert
2018-06-07 10:02 ` Andrea Bolognani
2018-06-07 10:22 ` Daniel P. Berrangé
2018-06-07 11:17 ` Andrea Bolognani
2018-06-07 12:38 ` Daniel P. Berrangé
2018-06-07 13:49 ` Dr. David Alan Gilbert
2018-06-07 14:06 ` Andrea Bolognani
2018-06-07 14:45 ` Dr. David Alan Gilbert
2018-06-07 14:56 ` Andrea Bolognani
2018-06-07 15:25 ` Dr. David Alan Gilbert
2018-06-07 20:38 ` Gerd Hoffmann
2018-06-07 10:32 ` Richard W.M. Jones
2018-06-07 10:35 ` Dr. David Alan Gilbert
2018-06-07 10:36 ` Daniel P. Berrangé
2018-06-07 10:54 ` Andrea Bolognani
2018-06-07 19:24 ` Laszlo Ersek
2018-06-08 8:21 ` Dr. David Alan Gilbert
2018-06-08 8:41 ` Daniel P. Berrangé
2018-06-08 8:53 ` Dr. David Alan Gilbert
2018-06-07 21:19 ` Michael S. Tsirkin
2018-06-07 21:18 ` Michael S. Tsirkin
2018-06-07 10:51 ` Andrea Bolognani
2018-06-07 19:38 ` Laszlo Ersek
2018-06-06 17:49 ` Max Reitz
2018-06-06 15:09 ` Michael S. Tsirkin
2018-06-06 17:06 ` Max Reitz
2018-06-07 21:43 ` Michael S. Tsirkin
2018-06-09 21:34 ` Max Reitz
2018-06-11 2:06 ` Michael S. Tsirkin
2018-06-11 8:16 ` Michal Suchánek
2018-06-06 11:42 ` Richard W.M. Jones
2018-06-06 11:48 ` Daniel P. Berrangé
2018-06-06 11:53 ` Max Reitz
2018-06-06 12:03 ` Dr. David Alan Gilbert
2018-06-06 13:15 ` Max Reitz
2018-06-06 12:29 ` Richard W.M. Jones
2018-06-06 11:22 ` [Qemu-devel] [Qemu-block] " Peter Krempa
2018-06-06 10:32 ` [Qemu-devel] " Michal Suchánek
2018-06-06 11:02 ` Max Reitz
2018-06-06 11:19 ` Michal Suchánek
2018-06-06 11:32 ` Max Reitz
2018-06-06 11:37 ` Dr. David Alan Gilbert
2018-06-06 11:44 ` Max Reitz
2018-06-06 12:16 ` Dr. David Alan Gilbert
2018-06-06 13:22 ` Max Reitz
2018-06-06 14:02 ` Dr. David Alan Gilbert
2018-06-06 14:33 ` Max Reitz
2018-06-06 14:41 ` Dr. David Alan Gilbert
2018-06-06 14:55 ` Max Reitz
2018-06-06 15:25 ` Michal Suchánek
2018-06-06 18:02 ` Max Reitz
2018-06-06 18:33 ` Michal Suchánek
2018-06-06 18:36 ` Eduardo Habkost
2018-06-07 18:27 ` [Qemu-devel] [Qemu-block] " Kashyap Chamarthy
2018-06-06 13:42 ` [Qemu-devel] " Eduardo Habkost
2018-06-06 14:55 ` Michael S. Tsirkin
2018-06-06 14:57 ` Max Reitz
2018-06-11 14:10 ` Kevin Wolf
2018-06-06 14:46 ` Michael S. Tsirkin
2018-06-06 15:04 ` Max Reitz
2018-06-06 11:43 ` Michal Suchánek
2018-06-06 11:52 ` Max Reitz
2018-06-06 12:13 ` Michal Suchánek
2018-06-06 13:14 ` Max Reitz
2018-06-06 13:45 ` Michal Suchánek
2018-06-06 13:50 ` Daniel P. Berrangé
2018-06-06 14:14 ` Eduardo Habkost
2018-06-06 14:21 ` Max Reitz
2018-06-06 14:24 ` Daniel P. Berrangé
2018-06-06 14:17 ` Max Reitz
2018-06-06 16:10 ` Eduardo Habkost
2018-06-06 18:09 ` Max Reitz
2018-06-11 8:44 ` Richard W.M. Jones
2018-06-06 11:40 ` Richard W.M. Jones
2018-06-06 14:31 ` Michael S. Tsirkin
2018-06-06 14:43 ` Michael S. Tsirkin
2018-06-06 14:57 ` Eric Blake
2018-06-06 20:39 ` Eric Blake
2018-06-06 21:01 ` Gerd Hoffmann
2018-06-06 15:02 ` Max Reitz
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