Re: [Xen-users] Cannot start domains after FC6->F7 upgrade

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Mark Williamson wrote:
> > > Did you reboot with the new Xen kernel? Or did you pull your kernel or
> > > assemble it form elsewhere?
> > >       
> > Yes.  Standard xen kernel.  But had to use the FC6 xen kernel because
> > the F7 xen kernel crashes on our hardware.
> >
> >     
> > > My local mirror does not have FC7 yet, so I haven't been able to play
> > > with it.
> > >       
> > I've opened a Fedora bug:
> > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=246169
> >     
> Chiming in here; I don't have a RH bugzilla account.
>
> The matching rules for kernel / tools / xen versions are a bit complex.  The 
> userspace tools and Xen itself must *always* be matched.
> Since around 3.0.4 (I think?) it's been possible to mix and match dom0 kernel 
> versions.  i.e. any dom0 kernel since 3.0.4 should run on any Xen from 3.0.4.  
> Before that release the dom0 and Xen interfaces were tied together and you 
> couldn't really mix and match /at all/.  Although you couldn't strictly mix 
> and match, you could sometimes get dom0 to boot on Xen, but things didn't 
> work properly - this may be what you're seeing, I guess.
> Could you rebuild your kernel to not use libata?
>   
Hmm. Doing a "yum update" OS update is prone to interesting issues as 
kernel versions switch: I've had SATA controllers switch the name of the 
necessary driver, and even had those ghods-awful Promise controllers 
switch from calling drives hda to calling them sda. (THAT caused serious 
swearing, because upgrading kernels meant re-writing /etc/fstab, and so 
did rolling the kernel back.
Gerry, can you do a CD or DVD based update operation and rebuild your 
grub.conf and corresponding modprobe.conf settings?
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