SR-IOV in CVM

[mstewart_83]

Is SR-IOV supported in CVM for HyperV 2022? When I enable it on the CVM virtual machine nic, I get a message in HyperV manager that the nic status is degraded (sr-iov not operational).

Thanks,

[yaroslav (staff)]

SR-IOV is supported by CVM.
The question is whether your NIC supports SR-IOV.
Make sure it can be toggled in BIOS.

[mstewart_83]

I'm using Quad port Intel E810 25GB adapters which do support SR-IOV. I don't have any issues enabling it on Windows VMs. It's just the Starwind CVM appliances that have the issue.

Is there something that I need to do within the CVM console to get SR-IOV working?

[yaroslav (staff)]

Thanks for your update.
Oh, I love those NICs. From my experience E810s are quite tricky in terms of drivers, MTUs, and RDMA support. May be tricky for the future NVMe-oF/RoCE support.
You do not need to do any specific settings with CVM. Can you please let me know how exactly it is not working? Having screenshots will be helpful.
There is a known issue with SR-IOV support where the virtual function inherits the adapter properties instead of being just a listener. The problem manifests itself as the adapter going dark after the restart. It can be fixed by a series of restarts. This occasionally happens on Hyper-V. If this is a lab, we could have a call (reach out to support@starwind.com; this thread and 1135675 will be your references) to poke around your cluster.
If that does not work for you, please configure Hyper-V switches instead of SR-IOV while we are working on the fix.

[geekbeets]

Thanks, got it working.

[yaroslav (staff)]

You are welcome.

[villagetunic]

I can confirm that my adapters, which are quad port Intel E810 25GB, are SR-IOV compatible. On Windows virtual machines, I have no problems turning it on. The problem only occurs with the Starwind CVM equipment.

[SiegfriedB]

Just to quickly chime in here: This is still unresolved for me (E810 SR-IOV with CVM). It's been a couple of months since I last touched this subject but, if memory serves, E810 SR-IOV works in a Hyper-V Windows VM and it works in an Ubuntu Live VM out of the box but it doesn't work in the CVM. Perhaps the virtual function driver (iavf) in the CVM needs to be updated?

From Ubuntu live with SR-IOV working:

[yaroslav (staff)]

Hi,

Thanks for your update.
May I wonder if you updated the CVM to the latest build already?

[SiegfriedB]

Hi,

Thanks for your update.
May I wonder if you updated the CVM to the latest build already?

I was testing with the version downloaded on Oct, 13 2023.

[yaroslav (staff)]

There has been a new build released this month. Please check it out.