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[Sean Dague <sean@xxxxxxxxx>]

I feel like this is a feature add for a hypervisor that never supported
this. It's fine to fix, but it should be thought of as a feature not a
bug.

** Changed in: nova
       Status: Incomplete => Opinion

** Changed in: nova
   Importance: Low => Wishlist

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https://bugs.launchpad.net/bugs/1282506

Title:
  live migrations not possible when using Libvirt/Xen with Cinder/NFS

Status in OpenStack Compute (Nova):
  Opinion

Bug description:
  Live migrations are not possible when using Libvirt/Xen with
  Cinder/NFS as storage backend.

  InvalidSharedStorage: xxx is not on shared storage: Live migration can
  not be used without shared storage.

  The issue is in the method check_can_live_migrate_source in
  nova/virt/libvirt/driver.py. has_local_disks is True, even if there
  are only volumes attached to an instance (is_volume_backed is also
  True). has_local_disks is True because get_instance_disk_info()
  returns disks as local because of the disk type file. NFS volumes are
  available with the disk type file in Libvirt and the method
  get_instance_disk_info() doesn't check if those disks are volumes or
  local disks.

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