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Re: [Qemu-devel] [question] incremental backup a running vm


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [question] incremental backup a running vm
Date: Mon, 26 Jan 2015 10:29:24 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0


On 26/01/2015 02:07, Zhang Haoyu wrote:
> Hi, Kashyap
> I've tried ‘drive_backup’ via QMP,
> but the snapshots were missed to backup to destination,
> I think the reason is that backup_run() only copy the
> guest data regarding qcow2 image.

Yes, that's the case.

QEMU cannot still access internal snapshots while the file is open.
External snapshots are opened read-only, and can be copied with "cp"
while QEMU is running.

Paolo



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