From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Hajnoczi <stefanha@gmail.com>
Subject: Re: [Qemu-devel] implement lvm-aware P2V to reduce time cost
 significantly for linux server
Date: Fri, 2 Jan 2015 10:19:29 +0000
Message-ID: <20150102101929.GA10823@stefanha-thinkpad.redhat.com>
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Cc: kvm-devel <kvm@vger.kernel.org>,
	qemu-devel <qemu-devel@nongnu.org>,
	Paolo Bonzini <pbonzini@redhat.com>
To: Haoyu Zhang <zhhy.zhanghaoyu@gmail.com>
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On Sat, Dec 27, 2014 at 09:28:53AM +0800, Haoyu Zhang wrote:
> I want to P2V a redhat server to kvm vm, and lvm was used to manage disks
> in the redhat server.
> I want to only migrate the really used storage to vm image, which can
> reduce the time cost significantly sometimes,
> so I need the information of logical volume to physical disks bitmap, to
> know which physical sectors were really used,
> any ideas?
> Is there a tool off-the-shelf have implemented the target?

Have you looked at virt-p2v(1)?

http://libguestfs.org/virt-p2v.1.html

I'm not sure if it sparsifies the disk image during conversion or
whether you would have to run virt-sparsify(1) afterwards
(http://libguestfs.org/virt-sparsify.1.html).  virt-sparsify(1) can
definitely unmap LVM's unused space.

Stefan

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