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

[James Harper <james.harper@xxxxxxxxxxxxxxxx>]

> 
> 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.

James

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