From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Zhang Haoyu" <zhanghy@sangfor.com.cn>
Subject: [question] incremental backup a running vm
Date: Wed, 21 Jan 2015 18:32:34 +0800
Message-ID: <201501211832330964659@sangfor.com.cn>
Mime-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	"Fam Zheng" <famz@redhat.com>
To: "qemu-devel" <qemu-devel@nongnu.org>, "kvm" <kvm@vger.kernel.org>
Return-path: <kvm-owner@vger.kernel.org>
Received: from smtp.sangfor.com.cn ([58.251.49.30]:40896 "EHLO
	mail.sangfor.com.cn" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751145AbbAUKcl (ORCPT <rfc822;kvm@vger.kernel.org>);
	Wed, 21 Jan 2015 05:32:41 -0500
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

Hi,

Does drive_mirror support incremental backup a running vm?
Or other mechanism does?

incremental backup a running vm requirements:
First time backup, all of the allocated data will be mirrored to destination,
then a copied bitmap will be saved to a file, then the bitmap file will log dirty for
the changed data.
Next time backup, only the dirty data will be mirrored to destination.
Even the VM shutdown and start after several days,
the bitmap will be loaded while starting vm.
Any ideas?

Thanks,
Zhang Haoyu