[Xen-users] vm create test ="losetup /dev/loop0 /data/xen/domains/test/disk.img failed"

[Christian Nitschmann <christian.nitschmann@xxxxxxxxxx>]

Dear mailing-list

after several attempts to start a xen linux-vm on a Fedora 8 XEN-System
(Quadcore Xeon-System with 8GB RAM and VT/PAE enabled), i now really
need your help.

I sucessfully created and installed a new debian etch-vm with the well
known debootstrap-script. I got 10 unused loop-devices which should be
more than enough for at least one xen-machine.

When i try to start the new debian-etch-machine with "*xm create
/etc/xen/test -c*" i always get the following error message:
-------------------------------
Using config file "./test".
Error: Device 2049 (vbd) could not be connected. losetup /dev/loop0
/data/xen/domains/test/disk.img failed
-------------------------------

*xen-hotplug.log:*
-------------------------------
Nothing to flush.
/data/xen/domains/test/disk.img: Permission denied
xenstore-read: couldn't read path backend/vbd/2/2049/node
-------------------------------

The entire directory is world-accessible and writable, so there should
be no permission-problems with accessing the disk-images (VBD). I am
using the root-account to start the xen-vm.

*The configuration-file for the "test"-vm looks like this:*
-------------------------------
# Configuration file for the Xen instance vm01.example.com, created on
# Mon Jun 2 17:06:01 2008.
# Kernel + memory size
kernel = '/boot/vmlinuz-2.6.21.7-3.fc8xen'
ramdisk = '/boot/initrd-2.6.21.7-3.fc8xen.img'
memory = '128'
# Disk device(s).
root = '/dev/sda1 ro'
disk = [ 'file:/data/xen/domains/test/disk.img,sda1,w',
'file:/data/xen/domains/test/swap.img,sda2,w' ]
# Hostname
name = 'test'
# Networking
dhcp = 'dhcp'
vif = [ '' ]
# Behaviour
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
---------------------------------

An attempt to mount the disk-images to an unused-loop-device with
losetup works without any problems.

----------------------------------
[root@dmxen xen]# losetup /dev/loop0 /data/xen/domains/test/disk.img
[root@dmxen xen]# losetup -a
/dev/loop0: [0902]:192479239 (/data/xen/domains/test/disk.img)
----------------------------------

System details:
_Kernel:_ Linux dmxen 2.6.21.7-3.fc8xen #1 SMP Thu Mar 20 14:57:53 EDT
2008 i686 i686 i386 GNU/Linux
Xen-Version: Xen 3.1.2


Any help or information would be very welcome.

Thanks in advance

Christian



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