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[Launchpad Bug Tracker <1887380@xxxxxxxxxxxxxxxxxx>]

[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

** Changed in: nova
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1887380

Title:
  Attaching virtual GPU devices to guests in nova

Status in OpenStack Compute (nova):
  Expired

Bug description:

  This bug tracker is for errors with the documentation, use the
  following as a template and remove or add fields as you see fit.
  Convert [ ] into [x] to check boxes:

  - [X] This is a doc addition request.

  Hi, a problem came up when we are using nova(Queens) configured with
  the vGPU feature to create several instances. It seems multiple
  instances preempt the same vGPU resource, in our case, on the exact
  same instance which has acquired a vGPU already. Here is the error
  reported in the log:

  "libvirt.libvirtError: Requested operation is not valid: mediated
  device /sys/bus/mdev/devices/xxx is in use by driver QEMU, domain xxx"

  Apparently, nova is trying to allocate the vGPU resource that is
  already being used by another instance. Also, we ruled out a situation
  that there is not enough vGPU resources on the host. In our case, 25%
  of instances fell into error-creating state while we are only creating
  instances which only need 50% of all vGPU resources. From our
  perspective, the problem is with the nova-scheduler. Any idea how to
  work this out?

  Thanks

  Ruien Zhang
  zhangruien@xxxxxxxxxxxxx

  -----------------------------------
  Release: 21.1.0.dev214 on 2020-04-28 20:09:00
  SHA: d19f1ac47b0a5fe1dd80b7187087e5810501f16c
  Source: https://opendev.org/openstack/nova/src/doc/source/admin/virtual-gpu.rst
  URL: https://docs.openstack.org/nova/latest/admin/virtual-gpu.html

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