Switching from IDE to virtio_blk [qas Re: [Fedora-xen] Goodbye Xen on RH/Fedora?]

['Jan ONDREJ (SAL)']

You missed, that I am migrating not only my packages, but my whole virtual
machine from paravirtualized Xen to paravirt. driver KVM.
This mkinitrd magic is only required for disk driver change (xenblk_front to
virtio_blk).
So it's something different, like your upgrade of CentOS.

	SAL

On Wed, Jan 21, 2009 at 01:47:34PM -0500, Dustin Henning wrote:
> 	It is probably worth noting that if someone were to run a kernel
> update with a package manager after getting this working (using information
> from later posts in this thread), they would need to do a manual mkinitrd.
> At least that was my experience some time ago when switching from hda to sda
> in CentOS, future kernel-xen versions installed via yum tried to boot to hda
> and failed.  However, I think I actually recompiled originally, though, as
> opposed to adding the new drivers to initrd, so I could be wrong.
> 	Dustin
> 
> -----Original Message-----
> From: fedora-xen-bounces at redhat.com [mailto:fedora-xen-bounces at redhat.com]
> On Behalf Of Mark McLoughlin
> Sent: Wednesday, January 21, 2009 08:49
> To: Jan ONDREJ (SAL)
> Cc: Fedora Xen
> Subject: Switching from IDE to virtio_blk [qas Re: [Fedora-xen] Goodbye Xen
> on RH/Fedora?]
> 
> (This is all getting offtopic for fedora-xen, we should really move to
> fedora-virt)
> 
> On Wed, 2009-01-21 at 14:28 +0100, Jan ONDREJ (SAL) wrote:
> >  virtio_net works well, but I have trouble to boot from virtio_blk.
> > 
> > I can add second disk as virto block device, but I can't boot from
> > first disk.
> 
> When switching from IDE to virtio, you need to first build a new initrd
> in the guest with e.g.:
> 
>   $> mkinitrd --with virtio_pci --with virtio_blk -f
> /boot/initrd-$(kernelversion) $(kernelversion)
> 
> You only need to do this once. After that, if a new kernel is installed
> while you're booted off a virtio disk, then mkinitrd will include the
> modules automatically.
> 
> Cheers,
> Mark.
> 
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