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https://bugzilla.redhat.com/show_bug.cgi?id=979477 Since 1.0.3 we are using the new way to copy non shared storage during migration (the NBD way). However, whether the new or old way is used is not controllable by user but unconditionally turned on if both sides of migration support it. Moreover, the implementation is not complete: the combination for VIR_MIGRATE_TUNNELLED flag is missing (as we need to open new port on the destination) in which case we just error out. This is a deadly combination: not letting users choose their destiny and erroring out. We should not do that but VIR_WARN and turn the NBD off instead.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>