Ok, so even though the physical interface seems to connect at 1000FDX, and I can indeed get speeds over 100Mbit/s, this thing is just not working correctly on the network level. When transferring files, it rains rx errors. At a certain point I guess the system decides that it has seen enough errors, and disables the interface or something. Result is that network connectivity to and from the Unraid EX470 is gone. ifconfig eth0 down and up restores the network. I have tried:
Different cables, cat5e, cat6a
Different switch (Netgear Gs108p instead of Unify Switch
Enabled SMB for Mac
Changed MTU to 1492 and 1024
Toggled all Bios options
Half duplex
100FDX
I have attached diagnostics from right after a copy failure just now. Just before the root login the network was dropped. Bios settings are the optimal default, with the changes to see all 4 disks and the boot order to boot from USB.
This was my first Unraid experience, so maybe someone with more experience can see something obvious that I don't. If not, I guess the network hardware/driver combination is just not working together with Linux (There are more issues with other Linux flavours in combination with this network interface it seems)
tower-diagnostics-20220522-0937.zip