We have the same problem on XenServer 6.0.
Only valid disk boot device it offers is CDROM.

Regards

On 01. 05. 2012 05:10, moto kawasaki wrote:
> The following reply was made to PR kern/166174; it has been noted by GNATS.
> 
> From: moto kawasaki <m...@kawasaki3.org>
> To: bug-follo...@freebsd.org
> Cc: ilsuj...@gmail.com
> Subject: Re: kern/166174: [xen] Problems ROOT MOUNT ERROR <freebsd 8.3>
> Date: Tue, 01 May 2012 12:00:02 +0900 (JST)
> 
>  Hi,
>  
>  I'd report the similar case which I am facing.
>  
>  My envrionment is;
>    XenServer 5.6 SP2
>    FreeBSD 8.3-RELEASE (amd64) -- XENHVM kernel
>  
>  when booting this FreeBSD VM, its kernel cannot mount root disk.
>  
>  (case 1: ad0s1a, from /etc/fstab) ==========================
>  
>  
>  ums0: <Endpoint1 Interrupt Pipe) on usbus0
>  ums0: 3 buttons and [Z] coordinates ID=0
>  Trying to mount root from ufs:/dev/ad0s1a
>  ROOT MOUNT ERROR:
>  If you have invalid mount options, reboot, and first try the following from
>  the loader prompt:
>  
>       set ufs.root.mountfrom.options=rw
>  
>  and then remove invalid mount options from /ete/fstab.
>  
>  Loader variables:
>  vfs.root.mountfrom=ufs:/dev/ad0s1a
>  vfs.root.mountfrom.options=rw
>  Manual root filesgstem specification:
>    <fstype>:<device>  Mount <device> using filesystem <fstype>
>                         eg. ufs:/dev/da0s1a
>                         eg. cd9660:/deu/acd0
>                         This is equivalent to: mount -t cd9660 /deu/acd0 /
>    ? List valid disk boot devices
>    <empty line> Abort manual input
>  
>  mountroot> _
>  ============================================================
>  
>  (case 2: xbd, entered by hand just after the case 1) =======
>  mountroot> ufs:/dev/xbd0s1a
>  Trying to mount root from ufs:/dev/xbd0s1a
>  ROOT MOUNT ERROR:
>  If you have invalid mount options, reboot, and first try the following from
>  the loader prompt:
>  
>       set ufs.root.mountfrom.options=rw
>  
>  and then remove invalid mount options from /ete/fstab.
>  
>  Loader variables:
>  vfs.root.mountfrom=ufs:/dev/ad0s1a
>  vfs.root.mountfrom.options=rw
>  Manual root filesgstem specification:
>    <fstype>:<device>  Mount <device> using filesystem <fstype>
>                         eg. ufs:/dev/da0s1a
>                         eg. cd9660:/deu/acd0
>                         This is equivalent to: mount -t cd9660 /deu/acd0 /
>    ? List valid disk boot devices
>    <empty line> Abort manual input
>  
>  mountroot> _
>  ============================================================
>  
>  
>  
>  HVMXEN kernel of FreeBSD 8.2-RELEASE-p6 works just fine in this
>  environment.
>  
>  Also, I can try other "mountroot>" devices if you could tell me within
>  a day or two.
>  
>  Thank you!!
>  
>  
>  
>  
>  Best Regards,
>  
>  
>  
>  -- 
>  moto kawasaki <m...@kawasaki3.org>
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