I think a good way to get that is to shrink the filesystem of the
original disk, shrink the disk itself and convert the file-based image
to the LV like you do.
Once done, you can extend the LV and the filesystem back to what it was
before the process if needed.
Other than that, I don't know a way to get what you want with the
current tools.
Thanks Nicholas, the above seems to have worked.
Quite a few steps, though - so prone to error ...
When you say 'tools' I think you mean that qemu-img cannot at the moment
support conversion to thin LVs.
Edoardo Comar
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