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

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?

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.


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

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