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When 'pause-before-switchover' is enabled, the outgoing migration will pause before invalidating the block devices and serializing the device state. At this point the management layer gets the chance to clean up any device jobs or other device users before the migration completes. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>