Re: [Xen-users] where does qemu fit in?

[Miles Fidelman <mfidelman@xxxxxxxxxxxxxxxx>]

Ian Campbell wrote:
> On Wed, 2013-01-02 at 16:35 +0000, Miles Fidelman wrote:
>
>
> > Can you elaborate on this just a bit?  It sounds like one can use qemu
> > drivers from an HVM, to access the PV drivers.  But what about the other
> > way around?  I'm running PV guests, so normally qemu doesn't apply,
> > but... what I'm trying to figure out is whether there's some way to use
> > the qemu drivers to access the sheepdog cluster file system - which only
> > provides a qemu interface.
> I'm not sure what you mean by "qemu drivers". Do you mean virtio?
qemu-dm

> Looking (very briefly) at the sheepdog page it looks KVM specific to me,
> I wouldn't expect it to Just Work on Xen -- someone would need to do a
> porting job.
There's a good diagram on slide 5 of 
http://www.osrg.net/sheepdog/_static/lca2010_miniconf.pdf
It looks like sheepdog's servers (which talk to disks) run directly on 
linux, while VMs access virtual block devices via qemu. Performance may 
be better w/ KVM, but sheepdog doesn't seem to depend on it.
There's been some discussion on the sheepdog development lists that 
sheepdog vdi devices (virtual disk images) are compatible with qemu-dm - 
which suggests that one could mount a sheepdog device from a HVM.  I'm 
wondering if there's a way to use qemu-dm from a PVM.
Miles


--
In theory, there is no difference between theory and practice.
In practice, there is.   .... Yogi Berra


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