Okay, I got it. Thanks very much for your answer. 在2021年12月13日 16:29，Alex Song (宋文平)<songwenping@inspur.com> 写道： Emm, the arq unbind cmd is used of deleting instance. Recently we donot support hot-plug/unplug device for instance. We only support binding devices when create instance and unbinding devices when delete instance. Best Regards. 发件人: Di XiaoLi [mailto:xiaolihope1008@163.com] 发送时间: 2021年12月13日 9:54 收件人: openstack-discuss <openstack-discuss@lists.openstack.org> 主题: [lists.openstack.org代发][cyborg][nova][qa]Question about Accelerator unbinding hi, Cyborg and nova team: I am using cyborg with "Wallaby" release to manage my accelerator devices, while I'm trying to unbind the accelerator I found that the device was not actually unbound from the virtual machine. Here are my questions: 1. What is the function of the arq unbind command in cyborg ? 2. How to unbind the accelerator which bounded to vm? Does nova or cyborg support this function now？ Here are my steps: step1: openstack accelerator arq unbind ed205084-f58d-4fad-99b4-327a1398858f +---------------------+--------------------------------------+ | Field | Value | +---------------------+--------------------------------------+ | uuid | ed205084-f58d-4fad-99b4-327a1398858f | | state | Unbound | | device_profile_name | ssd | | hostname | None | | device_rp_uuid | None | | instance_uuid | None | | attach_handle_type | | | attach_handle_info | {} | +---------------------+--------------------------------------+ step2: login vm and check the device, but it still here. step3: stop vm and start vm, met the following error: "nova.exception.AcceleratorRequestOpFailed: Failed to get accelerator requests: Cyborg returned no accelerator requests for instance ca77ef4e-421c-4c6c-9d76-7618a90ec921"