From: Eric Blake <eblake@redhat.com>
To: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Cc: kwolf@redhat.com, sheepdog@lists.wpkg.org, qemu-devel@nongnu.org,
stefanha@redhat.com
Subject: Re: [Qemu-devel] [PATCH 0/3] sheepdog: support online snapshot from qemu-img
Date: Thu, 25 Apr 2013 07:44:29 -0600 [thread overview]
Message-ID: <5179333D.1040501@redhat.com> (raw)
In-Reply-To: <1366886263-21263-1-git-send-email-morita.kazutaka@lab.ntt.co.jp>
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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.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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next prev parent reply other threads:[~2013-04-25 13:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-25 10:37 [Qemu-devel] [PATCH 0/3] sheepdog: support online snapshot from qemu-img MORITA Kazutaka
2013-04-25 10:37 ` [Qemu-devel] [PATCH 1/3] sheepdog: cleanup find_vdi_name MORITA Kazutaka
2013-04-25 10:37 ` [Qemu-devel] [PATCH 2/3] sheepdog: add SD_RES_READONLY result code MORITA Kazutaka
2013-04-25 10:37 ` [Qemu-devel] [PATCH 3/3] sheepdog: resend write requests when SD_RES_READONLY is received MORITA Kazutaka
2013-04-25 13:08 ` [Qemu-devel] [sheepdog] " Liu Yuan
2013-04-25 16:16 ` MORITA Kazutaka
2013-04-25 13:56 ` [Qemu-devel] " Stefan Hajnoczi
2013-04-25 13:44 ` Eric Blake [this message]
2013-04-25 14:01 ` [Qemu-devel] [sheepdog] [PATCH 0/3] sheepdog: support online snapshot from qemu-img Liu Yuan
2013-04-25 14:06 ` [Qemu-devel] " Stefan Hajnoczi
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