FreeBSD Xen DomU boot from drbd fails with error 19

[Roger Pau Monné]

On Sat, Oct 22, 2016 at 04:14:33PM -0400, niek at bigfoot.com wrote:
> Running a FreeBSD 11.0-RELEASE HVM guest, using ufs, on Xen 4.4 (debian
> jessie) on LVM with drbd 8.4. The FreeBSD guest boots fine from LVM
> using 'disk' /dev/<vg>/<volume> in domU config.
> 
> I have a number of Linux guests running on drbd (8.4). Booting FreeBSD
> from the drbd device associated with drbd (with 'disk' /dev/drbdx)
> fails. I know I can't use drbd:<resource> with HVM guest.
> 
> Trying to mount root from ufs:/dev/xbd0p2 [rw]...
> mountroot: waiting for device /dev/xbd0p2...
> Mounting from ufs:/dev/xbd0p2 failed with error 19.

Ops, hit send to soon. Can you also paste the output of `xenstore-ls -fp` 
executed from Dom0 when the guest is in this state?

Thanks, Roger.