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"