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

From: Christoph Hellwig
Subject: Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format
Date: Wed, 8 Sep 2010 17:38:57 +0200
User-agent: Mutt/1.3.28i 
On Wed, Sep 08, 2010 at 12:15:13PM +0100, Stefan Hajnoczi wrote:
> In-place writes overwrite old data in the image file.  They do not
> allocate new clusters or update any metadata.  This is why write
> performance is comparable to raw in the long run.

Only if qed doesn't cause additional fragmentation.  Which it currently
does.
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