def get_available_fcp(self):
        """get all the fcps not reserved"""
        # get the unreserved FCP devices belongs to assigner_id
        available_list = []
        free_unreserved = self.db.get_all_free_unreserved()
        for item in free_unreserved:
            available_list.append(item[0])
        return available_list
get all the fcps not reserved