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Does the Proxmox host have the driver installed for your 2.5Gb NIC? Can't use it if it's not installed. Connect to the host and run
ethtool <device>. Should show the link speed asSpeed:.If you need ultra-speed data, why not do a 100GbE switch with JBOD? 40TB isn't a small amount of data. Generally no matter what setup you have it's going to take a significant amount of time to swap data here.
I haven't installed any drivers on the Proxmox machine. That one has the 2.5Gb NIC built into the motherboard so I probably misspoke when I called it a "card" in the OP if that makes a difference. I'll try this when I get home but I have run 'lspci' and it shows the NIC on both the host and container (Intel Killer 3100 2.5Gb though it's listen as Killer 3000 2.5Gb) plus my iperf3 tests were showing ~2.3Gb speeds between both machines and the container.
As far as the 100GBe switch, I only need to transfer the media off the old machine once so I was just trying to go with something inexpensive since the standard 1Gb ethernet should be fine for most things after this initial transfer.
I've had a chance to run this and ethtool is showing 2500Mb/s for the speed on the host. I also tried it on the bridge and inside the container and those both show "10000Mb/s"
Linux doesn't have drivers like Windows does. The kernel either supports the hardware or it doesn't.
This is categorically untrue. The kernel includes most open source drivers however it does not include proprietary drivers (or even all open source drivers) which require recompiling the kernel itself or installing secondary headers...
I've used many networking cards in the past that required you to recompile the kernel for them to work properly...