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

[Dustin Henning]

	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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