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[Xen-users] Share of disks in read only between dom0 and domU.

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Subject: [Xen-users] Share of disks in read only between dom0 and domU.
From: Michel Gaudet <Michel.Gaudet@xxxxxxxx>
Date: Thu, 27 Sep 2007 09:55:41 +0200
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Hello !

Because of a special config of my grub boot system, i try to export in a domU, in read only mode, one of my disk partition mounted in the dom0 (in RW) and i don't succeed because xen refuse to export this disk partition in a domU.

extract of the conf :

disk = [ 'phy:/dev/sda,ioemu:hda,r' , 'phy:/dev/sda6,ioemu:sda6,r]' ,
'phy:/dev/sda1,ioemu:sda1' ]

The first disk for grub to access the MBR , the second for grub to obtain its 
1.5 and
second stage and the third to reach the guest OS.

I block at the export of the sda6 which is the / of my dom0 with the message :

Error: Device 2054 (vbd) could not be connected.
Device /dev/sda6 is mounted read-write in the privileged domain,
and so cannot be mounted read-only by a guest.

If i don't mount the /dev/sda6 the domU begin the boot but it freeze with the 
error :

Booting from Hard Disk
GRUB Loading stage1.5.

GRUB loading, please wait...
Error 5

Error 5 is : Partition table invalid or corrupt

But we can boot normally our 2 OS without xen.

I think it is because it don't see the partition onto which is the grub install 
: /dev/sda6

I understand why it is forbidden to mount in RW the same disk but in R ?

In fact i try to boot a domU Windows XP installed on a disk with 2 primary partitions and 1 extended, itself with the 3 partitions of the SuSE 10.2 xen install with its dom0.
The grub is installed on the MBR of the SATA disk and the XP on the 1st primary 

Some ideas ?

Thanks a lot.



   ^  ^ ----           Michel GAUDET          +--- |  | +--- +--- +---
  /| /||    |            CRI/SIR              |__  |__| |__  |__  |__
 / |/ ||  __      Ecole des Hautes Etudes     |    |  | |       |    |
/     ||____|       en Sciences Sociales      +--- |  | +--- ---+ ---+
              54 Boulevard RASPAIL 75006 PARIS
    Tel:(33) 01 49 54 25 91           Email: Michel.Gaudet@xxxxxxxx
    FAX:(33) 01 49 54 26 85

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