Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm

[Avi Kivity]

On 05/21/2010 12:29 AM, Anthony Liguori wrote:
> I'd be more interested in enabling people to build these types of 
> storage systems without touching qemu.
>
> Both sheepdog and ceph ultimately transmit I/O over a socket to a 
> central daemon, right? 

That incurs an extra copy.

> So could we not standardize a protocol for this that both sheepdog and 
> ceph could implement?

The protocol already exists, nbd.  It doesn't support snapshotting etc. 
but we could extend it.

But IMO what's needed is a plugin API for the block layer.

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