On Wed, Nov 27, 2013 at 02:37:02PM +0200, Laine Stump wrote:
> Awhile back a bug was filed against libvirt about the inability to
> completely exclude a disk from the boot order:
> 
>    https://bugzilla.redhat.com/show_bug.cgi?id=888635
> 
> In short, you can't have a domain that used PXE to boot, but also has an
> un-bootable disk device *even if that disk isn't listed in the boot
> order*, because if PXE times out (e.g. due to the bridge forwarding
> delay), the BIOS will move on to the next target, which will be the
> unbootable disk device (again - even though it wasn't given a boot
> order), and get stuck at a "/BOOT DISK FAILURE, PRESS ANY KEY" message
> /until a user intervenes.
> 
> It was obviously beyond the ability of libvirt to fix this (although it
> can be worked around by creating a very small disk image with a
> bootloader that merely instructs the system to reboot, and placing
> *that* disk in the boot order just after the PXE device), so the BZ was
> closed as CANTFIX.

I'm fairly sure that the current behaviour we have is a regression vs
the original libvirt QEMU driver prior to use of seabios. IOW, I think
we should unconditionally be enabling strict=on to fix the flaw.

Daniel
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