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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 20 Dec 2013, James Harper 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.
> > 
> 
> I finally got rbd working under Debian with qdisk.
> 
> I had to enable rbd in qemu (and not build the static user package as the 
> build seems to be broken for rbd/rados static), then patch libxl so it would 
> accept a format of rbd. Repeating what I said in xen-users, having an 
> artificial restriction on formats for qdisk is a bit of a pain for something 
> that should "just work". Is this resolved in newer versions? Or maybe there 
> is some secret sauce I'm missing?
> 
> Anyway, now I can use a disk config of:
> 
> rbd:prod/virt-zoneminder-root,rbd,xvda1,rw,backendtype=qdisk
> 
> and get rbd with ceph under hvm. Probably pv too but I can't seem to get an 
> 'xl console' working to check right now.

Nice! Please send the libxl patches to the list!

The reason why libxl has a specific list of supported formats is that we
thought that a simple wildcard and external bash scripts without a clear
calling convention were too fragile. Of course if RDB "just works", we
should enable it in libxl.

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