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

[Avi Kivity]

 On 09/09/2010 09:45 AM, Avi Kivity wrote:
> > A new format doesn't introduce much additional complexity.  We 
> > provide image conversion tool and we can almost certainly provide an 
> > in-place conversion tool that makes the process very fast.
>
> It requires users to make a decision.  By the time qed is ready for 
> mass deployment, 1-2 years will have passed.  How many qcow2 images 
> will be in the wild then?  How much scheduled downtime will be 
> needed?  How much user confusion will be caused?
>
> Virtualization is about compatibility.  In-guest compatibility first, 
> but keeping the external environment stable is also important.  We 
> really need to exhaust the possibilities with qcow2 before giving up 
> on it.

btw, if we were starting from scratch, I'd definitely pick qed over 
qcow2.  But we aren't starting from scratch (if we did, we wouldn't be 
doing x86 either).

--
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