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Date: Sat, 3 Jan 2015 00:47:10 +0000
From: "Richard W.M. Jones" <rjones@redhat.com>
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Subject: Re: [Qemu-devel] implement lvm-aware P2V to reduce time cost
 significantly for linux server
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To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: Haoyu Zhang <zhhy.zhanghaoyu@gmail.com>, qemu-devel <qemu-devel@nongnu.org>, kvm-devel <kvm@vger.kernel.org>, Paolo Bonzini <pbonzini@redhat.com>

On Fri, Jan 02, 2015 at 10:19:29AM +0000, Stefan Hajnoczi wrote:
> 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.

It sparsifies automatically during conversion.  No need to run
virt-sparsify afterwards :-)

Rich.

-- 
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