def METHOD_NAME(vm_name):
    """
    Attempt to delete a busy iothread disk.
    """
    thread_id = params.get("virt_disk_thread_id", "--id 2")
    ret = virsh.iothreaddel(vm_name, thread_id)
    iothread_error = True
    disk_errors = \
        params.get("virt_disk_iothread_in_use_error")
    libvirt.check_exit_status(ret, iothread_error)
    libvirt.check_result(ret, expected_fails=disk_errors)