text: SELECT fn_db_add_column('disk_vm_element', 'is_using_scsi_reservation', 'BOOLEAN NOT NULL DEFAULT FALSE');
  
  UPDATE disk_vm_element dve
  SET is_using_scsi_reservation = vd.is_using_scsi_reservation
  FROM vm_device vd
  WHERE dve.disk_id = vd.device_id AND dve.vm_id = vd.vm_id;
  
  SELECT fn_db_drop_column('vm_device', 'is_using_scsi_reservation');
  