Re: [Qemu-devel] implement lvm-aware P2V to reduce time cost significantly for linux server

["Richard W.M. Jones" <rjones@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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