From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [question] incremental backup a running vm
Date: Mon, 26 Jan 2015 10:29:24 +0100
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References: <201501211832330964659@sangfor.com.cn>, <54BF81F0.9070908@redhat.com>, <20150122232948.GQ12638@tesla.redhat.com> <201501260907583380898@sangfor.com.cn>
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Cc: qemu-devel <qemu-devel@nongnu.org>, kvm <kvm@vger.kernel.org>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	Fam Zheng <famz@redhat.com>
To: Zhang Haoyu <zhanghy@sangfor.com.cn>,
	Kashyap Chamarthy <kashyapc@fedoraproject.org>
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On 26/01/2015 02:07, Zhang Haoyu wrote:
> Hi, Kashyap
> I've tried =A1=AEdrive_backup=A1=AF 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