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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Sun, 2013-12-08 at 15:07 +0000, Stefano Stabellini wrote:
> 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.

*if* You are using xl.

xend doesn't support upstream qemu at all. Not sure when/if it would use
the qemu-trad qdisk.

Ian.


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