Xen users - Mar 2007 - xen live migration error:VmError: Device 51712 (vbd) could not be connected. Hotplug scripts not working.

Hi all
I am trying live migration of a domain in fedora core 6.Both machines have
follwoing configuration.

[root@localhost xen]# rpm -qa|grep kernel
kernel-headers-2.6.18-1.2798.fc6
kernel-xen-2.6.18-1.2798.fc6
[root@localhost xen]# rpm -qa|grep xen
xen-3.0.3-0.1.rc3
xen-libs-3.0.3-0.1.rc3
kernel-xen-2.6.18-1.2798.fc6

The DomainU migrated to host2 ...it appeared in the watch xm list window as
a paused domain for a few seconds and then disappeared.

The /var/log/xen/xend.log file is:

[2007-03-03 20:19:53 xend 4900] DEBUG (balloon:127) Balloon: 237548 KiB
free; need 73728; done.
[2007-03-03 20:19:53 xend 4900] DEBUG (XendCheckpoint:155) [xc_restore]:
/usr/lib/xen/bin/xc_restore 21 2 18432 1 2
[2007-03-03 20:19:53 xend 4900] ERROR (XendCheckpoint:236) xc_linux_restore
start: max_pfn = 4800
[2007-03-03 20:19:53 xend 4900] ERROR (XendCheckpoint:236) Increased domain
reservation by 12000 KB
[2007-03-03 20:19:53 xend 4900] ERROR (XendCheckpoint:236) Reloading memory
pages:   0%
[2007-03-03 20:19:59 xend 4900] ERROR (XendCheckpoint:236) Received all
pages (0 races)
[2007-03-03 20:19:59 xend 4900] ERROR (XendCheckpoint:236) 100%
[2007-03-03 20:19:59 xend 4900] ERROR (XendCheckpoint:236) Memory reloaded.
[2007-03-03 20:19:59 xend 4900] ERROR (XendCheckpoint:236) Decreased
reservation by 2089 pages
[2007-03-03 20:19:59 xend 4900] ERROR (XendCheckpoint:236) Domain ready to
be built.
[2007-03-03 20:19:59 xend 4900] ERROR (XendCheckpoint:236) Restore exit with
rc=0
[2007-03-03 20:19:59 xend 4900] DEBUG (XendCheckpoint:209) store-mfn 42828
[2007-03-03 20:19:59 xend 4900] DEBUG (XendCheckpoint:209) console-mfn 51024
[2007-03-03 20:19:59 xend 4900] DEBUG (DevController:143) Waiting for
devices vif.
[2007-03-03 20:19:59 xend 4900] DEBUG (DevController:149) Waiting for 0.
[2007-03-03 20:19:59 xend 4900] DEBUG (DevController:464)
hotplugStatusCallback /local/domain/0/backend/vif/2/0/hotplug-status.
[2007-03-03 20:19:59 xend 4900] DEBUG (DevController:478)
hotplugStatusCallback 1.
[2007-03-03 20:19:59 xend 4900] DEBUG (DevController:143) Waiting for
devices usb.
[2007-03-03 20:19:59 xend 4900] DEBUG (DevController:143) Waiting for
devices vbd.
[2007-03-03 20:19:59 xend 4900] DEBUG (DevController:149) Waiting for 51712.
[2007-03-03 20:19:59 xend 4900] DEBUG (DevController:464)
hotplugStatusCallback /local/domain/0/backend/vbd/2/51712/hotplug-status.
[2007-03-03 20:21:39 xend.XendDomainInfo 4900] DEBUG (XendDomainInfo:1449)
XendDomainInfo.destroy: domid=2
[2007-03-03 20:21:40 xend.XendDomainInfo 4900] DEBUG (XendDomainInfo:1457)
XendDomainInfo.destroyDomain(2)
[2007-03-03 20:21:40 xend 4900] ERROR (XendDomain:268) Restore failed
Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/xen/xend/XendDomain.py", line
263,
in domain_restore_fd
    return XendCheckpoint.restore(self, fd)
  File "/usr/lib/python2.4/site-packages/xen/xend/XendCheckpoint.py",
line
165, in restore
    dominfo.waitForDevices() # Wait for backends to set up
  File "/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line
1596, in waitForDevices
    self.waitForDevices_(c)
  File "/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line
1090, in waitForDevices_
    return self.getDeviceController(deviceClass).waitForDevices()
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/DevController.py",
line 145, in waitForDevices
    return map(self.waitForDevice, self.deviceIDs())
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/DevController.py",
line 155, in waitForDevice
    raise VmError("Device %s (%s) could not be connected. "
VmError: Device 51712 (vbd) could not be connected. Hotplug scripts not
working.
[2007-03-03 20:23:15 xend 4900] DEBUG (DevController:464)
hotplugStatusCallback /local/domain/0/backend/vbd/2/51712/hotplug-status.
[2007-03-03 20:23:15 xend 4900] DEBUG (DevController:464)
hotplugStatusCallback /local/domain/0/backend/vbd/2/51712/hotplug-status.
[2007-03-03 20:23:15 xend 4900] DEBUG (DevController:464)
hotplugStatusCallback /local/domain/0/backend/vbd/1/51712/hotplug-status.
[2007-03-03 20:23:15 xend 4900] DEBUG (DevController:464)
hotplugStatusCallback /local/domain/0/backend/vbd/2/51712/hotplug-status.
[2007-03-03 20:23:15 xend 4900] DEBUG (DevController:464)
hotplugStatusCallback /local/domain/0/backend/vbd/1/51712/hotplug-status.
[2007-03-03 20:23:15 xend 4900] DEBUG (DevController:464)
hotplugStatusCallback /local/domain/0/backend/vbd/2/51712/hotplug-status.


There seems to be a problem creating the VBD. The DomainU has a LV backed
vbd in host1.

During migration ,is a new VBD created from scratch on destination
machine(host 1)?
Or do i manually need to allocate space for the VBD?


Thanks a lot.


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