Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format

[Christoph Hellwig]

On Wed, Sep 08, 2010 at 11:30:10AM -0500, Anthony Liguori wrote:
> http://wiki.qemu.org/Features/QED/OnlineDefrag
> 
> Is a spec for a very simple approach to online defrag that I hope we can 
> implement in the near future.  I think that once we have the mechanisms 
> to freeze clusters and to swap clusters, implementing much more 
> sophisticated defragmentation algorithms will become easy.

This image defragmentation might in fact cause even more fragmentation
at the filesystem layer.