Anyway, we should shield this cmd to avoid misoperation of arq and lead the instance start error for now.

发件人: Alex Song (宋文平)
发送时间: 2021年12月13日 16:27
收件人: 'xiaolihope1008@163.com' <xiaolihope1008@163.com>; 'openstack-discuss@lists.openstack.org' <openstack-discuss@lists.openstack.org>
主题: 答复: [lists.openstack.org代发][cyborg][nova][qa]Question about Accelerator unbinding

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"