libvirt users - May 2011 - Xen and live migration with VIR_MIGRATE_PERSIST_DEST

Hi,

I'm having a hard time to figure how to perform Xen live migration using
the python API with the same rate of success than virt-manager.

# virsh version
Compiled against library: libvir 0.8.3
Using library: libvir 0.8.3
Using API: Xen 3.0.1
Running hypervisor: Xen 3.2.0

The goal is to have the migration done in only one call, including a
definition in the remote xend and undefinition from the source, which
requires the VIR_MIGRATE_PERSIST_DEST and VIR_MIGRATE_UNDEFINE_SOURCE flags.
Here's the code doing the migration:
----------
flags = (libvirt.VIR_MIGRATE_LIVE ^
         libvirt.VIR_MIGRATE_PERSIST_DEST ^
         libvirt.VIR_MIGRATE_UNDEFINE_SOURCE)
uri = 'xenmigr://remote.host.com:8002'
domain_obj.migrate(con_handle, flags, None, uri, 0)
----------

There are various problems that occur randomly, such as the VM
completely disappearing 5 seconds after a succesful migration, but the
main issue is with VIR_MIGRATE_PERSIST_DEST that doesn't seem to have
any effect. The domU is not defined in xend and will vanish when
destroyed or on hypervisor reboot.

Could that be a known problem or related to a bug ? I'm really out of ideas.

Any help appreciated, Thank you !

-- 
Thibault VINCENT  -  IT
SmartJog S.A.S. - Groupe TDF - P?le multim?dia
27 Bd Hippolyte Marques, 94200 Ivry-sur-Seine, France
Phone: +33.1.58.68.62.38 / Fax: +33.1.58.68.60.97