Unable to make SMB Multichannel work in SCALE

TrueNAS General
1

I run 24.10 SCALE with mirror of 2 NVMe drives (no caches).

I have 25G Mellanox ConnectX-4 card passed through to TrueNAS from Proxmox.

I enable SMB with Multichannel and configure Windows 11 (client) with Multichannel support.

But it doesn’t work. No matter what I try, I only see one connection in Get-SmbMultichannelConnection or Get-SmbMultichannelConnection | ConvertTo-Json

smbstatus also shows only 1 connection on TrueNAS side.

I’m pretty sure my client is fine, as SMB multichannel works against Ubuntu based NAS (TerraMaster), I do see multiple connections in above commands.

Receive Side Scaling is enabled on Client side.

Any pointers on TrueNAS side ?

2

Just to add :

I don’t have LACP or any complicated stuff like that on TrueNAS side, just a single port 25G.

iperf3 between TrueNAS and client saturates 25G fine with multiple connections.