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Re: [Qemu-devel] pause and restore function before and after QEMU Live S
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] pause and restore function before and after QEMU Live Snapshot |
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Date: |
Wed, 16 Jul 2014 15:18:59 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 |
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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