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Re: [libvirt] [PATCH] Do not search xenstore for disk device IDs



On Mon, Mar 01, 2010 at 02:45:41PM +0100, Daniel Veillard wrote:
> On Tue, Feb 23, 2010 at 03:35:04PM -0700, Jim Fehlig wrote:
> > Daniel P. Berrange wrote:
> > > On Mon, Feb 22, 2010 at 02:50:07PM -0700, Jim Fehlig wrote:
> > >   
> > >> Disk devices can be referenced by name in Xen, e.g. when modifying
> > >> their configuration or remvoving them.  As such, don't search
> > >> xenstore for a device ID corresponding to the disk device.  Instead,
> > >> search the disks contained in the domain definition and use the
> > >> disk's target name if found.
> > >>
> > >> This approach allows removing a disk when domain is inactive.  We
> > >> obviously can't search xenstore when the domain is inactive.
> > >>     
> > >
> > > This sounds reasonable, but I'm wondering if old XenD support the
> > > lookup-based on name ?
> > >   
> > 
> > Yes, I had thought about this as well.  Guess it depends on how old we
> > are talking about.  It exists in Xen 3.1.x and newer.  I wonder if we
> > should even care about Xen 3.0.x.  The upstream tree hasn't been touched
> > in 3 years.
> 
>   Well we still ship this, so it would be appreciated if it didn't
> broke if libvirt got updated for some reasons ;-)

Yep, RHEL-5  still ships with Xen 3.0.x series & we aim to support that
in libvirt. I think we can probably just make your new approach be
conditional on the xendConfigVersion variable we already have.


Daniel
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