[Xen-users] Debian wheezy Xen 4.1.4 migration issue with tapdisk

[Jacek Jarosiewicz <xen-list@xxxxxxxxxxxxx>]

Hi,

I have a problem migrating VMs on Xen 4.1.4 (distribution install in 
wheezy).
The actual setup is Opennebula 4.0.1 + Xen

When I try to migrate VM i get the following error in nebula's log:

Wed Jun  5 14:54:54 2013 [VMM][E]: restore: Command "sudo /usr/sbin/xm 
restore /var/lib/one//datastores/0/23/checkpoint" failed: Error: 
/usr/lib/xen-4.1/bin/xc_restore 21 5 1 2 0 0 0 0 failed
Wed Jun  5 14:54:54 2013 [VMM][E]: Could not restore from 
/var/lib/one//datastores/0/23/checkpoint


..and in xend.log i see:

[2013-06-05 15:38:04 24698] INFO (XendDomainInfo:2357) createDevice: 
tap2 : {'protocol': 'x86_64-abi', 'uuid': 
'8c752883-8b03-5154-a318-aea9d510c99d', 'bootable': 1, 'dev': 
'xvda:disk', 'uname': 
'tap:tapdisk:aio:/var/lib/one//datastores/0/27/disk.0', 'mode': 'w', 
'VDI': '', 'backend': '0'}
[2013-06-05 15:38:04 24698] ERROR (XendDomainInfo:515) VM resume failed
Traceback (most recent call last):
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", 
line 511, in resume
    self._createDevices()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", 
line 2364, in _createDevices
    devid = self._createDevice(devclass, config)
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", 
line 2326, in _createDevice
    return self.getDeviceController(deviceClass).createDevice(devConfig)
  File 
"/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/BlktapController.py", line 
174, in createDevice
    device = TapdiskController.create(params, file)
  File 
"/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/BlktapController.py", line 
285, in create
    return TapdiskController.exc('create', '-a%s:%s' % (dtype, image))
  File 
"/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/BlktapController.py", line 
233, in exc
    (args, rc, out, err))
TapdiskException: ('create', 
'-aaio:/var/lib/one//datastores/0/27/disk.0') failed (512  )

same happens with live migration.

in VM config file I use disk this way:

disk = ['tap2:tapdisk:aio:/var/lib/one//datastores/0/24/disk.0,xvda,w']

..and it works. So my question is - is the blktap2 implementation still 
broken in debian wheezy? or is it xen-tools that are broken? or what? :)
Because obviously Xen tries to create disk device using tap:tapdisk:aio: 
scheme, which does not work..
How can I fix the issue so that migration works? Please help!

Cheers,
J

--
Jacek Jarosiewicz

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