Public bug reported:
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 zhangru...@bytedance.com ----------------------------------- 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 ** Affects: nova Importance: Undecided Status: New ** Tags: doc -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1887380 Title: Attaching virtual GPU devices to guests in nova Status in OpenStack Compute (nova): New 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 zhangru...@bytedance.com ----------------------------------- 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 To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1887380/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
