Re: [Xen-devel] [PATCH] libxl: prefer qdisk for <driver name='file'>

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-06-24 at 16:24 -0600, Jim Fehlig wrote:
> Ian Campbell wrote:
> > On Fri, 2014-06-20 at 15:07 -0600, Jim Fehlig wrote:
> >   
> >> The libxl driver currently sets the disk backend to
> >> LIBXL_DISK_BACKEND_TAP when <driver name='file'> is specified
> >> in the <disk> config.  qdisk should be prefered with this
> >> configuration, otherwise existing configuration such as the
> >> following, which worked with the old Xen driver, will not work
> >> with the libxl driver
> >>     
> >
> > OOI why not let libxl pick the most appropriate backend for (most of)
> > these alternatives?
> >   
> 
> I think the libvirt approach is to be a bit more explicit, instead of
> relying on hypervisor defaults that might change over time.  I'm quite
> sure this is the approach danpb has always advocated.

I thought that policy was more for guest visible things whereas the disk
backend is transparent to the guest.

But either way it's up to libvirt.

Thanks,
Ian.



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