'Return model update for migrated volume.
Each driver implementing this method needs to be responsible for the
values of _name_id and provider_location. If None is returned or either
key is not set, it means the volume table does not need to change the
value(s) for the key(s).
The return format is {"_name_id": value, "provider_location": value}.
:param volume: The original volume that was migrated to this backend
:param new_volume: The migration volume object that was created on
this backend as part of the migration process
:param original_volume_status: The status of the original volume
:returns: model_update to update DB with any needed changes'

def update_migrated_volume(self, ctxt, volume, new_volume, original_volume_status):

    msg = _('The    method    update_migrated_volume    is    not    implemented.')
    raise NotImplementedError(msg)
