From: Eric Blake <eblake@redhat.com>
To: Yuanzhen Gu <yg185@cs.rutgers.edu>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] pause and restore function before and after QEMU Live Snapshot
Date: Wed, 16 Jul 2014 15:18:59 -0600 [thread overview]
Message-ID: <53C6EC43.40507@redhat.com> (raw)
In-Reply-To: <CAOjERXwmLRVxJ2PJV-f_d9tDVWCSqc+VG0OQttjqb=7M5bAWiw@mail.gmail.com>
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On 07/16/2014 03:13 PM, Yuanzhen Gu wrote:
> Hi folks,
>
>
> I am going to make a patch, and need to find the pause and thaw(restore)
> function before and after taking Live QEMU Snapshot respectively.
Libvirt has the ability to do just that, when taking external disk-only
snapshots. You can turn on libvirt debugging to trace what QMP/agent
commands are sent during the overall snapshot operation.
>
>
> Basically, I'm using # (qemu) snapshot_blkdev <blockX>
> <snapshot-file><format> taking snapshot,
> http://wiki.qemu.org/Features/Snapshots my profile tool didn't work when
> giving command inside QMP.
>
>
> Does anyone know how to find the pause (freeze) and restore(thaw) function
> before and after taking snapshot? Or anyway using snapshot_blkdev command
> outside QEMU console? Thanks a lot in advance!
You have to coordinate multiple commands: freeze to the guest agent,
then snapshot to QMP, then thaw to the guest agent.
--
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:[~2014-07-16 21:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-16 21:13 [Qemu-devel] pause and restore function before and after QEMU Live Snapshot Yuanzhen Gu
2014-07-16 21:18 ` Eric Blake [this message]
2014-07-16 21:25 ` Andrey Korolyov
2014-07-16 21:48 ` Yuanzhen Gu
2014-07-16 21:51 ` Andrey Korolyov
2014-07-16 21:44 ` Yuanzhen Gu
2014-07-17 20:20 ` Yuanzhen Gu
2014-07-17 21:26 ` Eric Blake
2014-07-17 21:45 ` Yuanzhen Gu
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