Re: [Xen-devel] tapdisk in debian 3.11 kernel

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sat, 7 Dec 2013, James Harper wrote:
> > 
> > > I'm actually using ceph as the backend, and also using it on PV
> > > DomU's. Is qdisk only for HVM?
> > 
> > Is also for pv domUs, I use qdisk for both pv and hvm for months and no
> > problem found, only performance increased.

I would definitely recommend qdisk over tapdisk: you can simply use
upstream QEMU for development and works. Enabling Ceph should just be a
matter of passing the right command line arguments to QEMU.


> Any points on where I might get started using qdisk? I imagine that porting 
> ceph rbd to qdisk might not be particularly hard, if it hasn't been done 
> already

You simply need to specify qdisk as disk backend, for example:

/path/image,qcow2,hda,rw,backendtype=qdisk

actually if you use qcow2 as image format you don't even need to specify
backendtype=qdisk because it should default to it anyway.

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