Error: Device 768 (vbd) could not be connected. /etc/xen/scripts/block fail

Hello OTN,
After converting/exporting machines from VMware and importing them into OVM i am receiving errors on some of the machines when powering on.
Here is the complete error message:
Start - /OVS/running_pool/dirkwin
PowerOn Failed : Result - failed:<Exception: return=>failed:<Exception: ['xm', 'create', '/var/ovs/mount/483E943AE684484EAD7255356E8F24CC/running_pool/machinename/vm.cfg'] => Error: Device 768 (vbd) could not be connected. /etc/xen/scripts/block failed; error detected.
>
StackTrace:
File "/opt/ovs-agent-2.3/OVSXXenVM.py", line 57, in xen_start_vm
run_cmd(args=cmd)
File "/opt/ovs-agent-2.3/OVSCommons.py", line 85, in run_cmd
raise Exception('%s => %s' % (cmdlist, p.childerr.read()))
>
StackTrace:
File "/opt/ovs-agent-2.3/OVSSiteVM.py", line 131, in start_vm
raise e
Searching for this error turned up different solutions but none of them worked.
One mentioned OVM not being able to handle spaces in vm names but this is not a working solution as most of the machines are just regular names without spaces or special characters.
Also interesting, sometimes this error does not turn up when powering on BUT the machine just powers off again and returns to its turned off state. Next power on the error returns.
OS types vary from S10, Win XP and RedHat so a possible connection to the error being the host OS is not there.
Harddrive types are set to auto. The vm.cfg's of functioning machines do not differ from non functioning machines besides the actual vm name in the vm.cfg
Any idea to this error or how to solve it ?
Thanks
-Stephan

Hello Sebastian,
This is one of the vm.cfg which will abort due to the above mentioned error:
acpi = 1
apic = 1
builder = 'hvm'
device_model = '/usr/lib/xen/bin/qemu-dm'
disk = ['file:/var/ovs/mount/483E943AE684484EAD7255356E8F24CC/running_pool/vmname/vmname.img,hda,w',
',hdc:cdrom,r',
kernel = '/usr/lib/xen/boot/hvmloader'
memory = '2048'
name = 'vmname'
on_crash = 'restart'
on_reboot = 'restart'
pae = 1
serial = 'pty'
timer_mode = '0'
usbdevice = 'tablet'
uuid = 'a2a62bcb-f9ab-4ec3-8574-7415985cdf0a'
vcpus = 1
vif = ['bridge=xenbr0,mac=xx:xx:xx:xx:xx:xx,type=ioemu']
vif_other_config = []
vnc = 1
vncconsole = 1
vnclisten = '0.0.0.0'
vncpasswd = 'xx'
vncunused = 1
The xend.log also turned up nothing concerning this error. no messages were written into it. No other log has been created by xen in the /var/log/xen directory concerning an issue with the current machine.
Thanks for your help !
-Stephan
ps:mac address + pw is commented out
Edited by: Stephan Becker on Aug 5, 2010 7:11 AM

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Error: Device 768 (vbd) could not be connected. /etc/xen/scripts/block fail

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