I have two Supermicro 5019D Server, 4C/8T Xeon D-2123T (Built on the X11SDV-8C-TP8F motherboard), one is setup as a OPNsense router and the other unRAID server.

The OPNSense server SFP+ ports work with DAC cable to ubiquity no issues, unRAID build will not recognize them.

root@DockOfTheBay:~# for i in /sys/class/net/eth*; do n=${i##*/}; \
  printf "%-6s mac=%s  " "$n" "$(cat $i/address)"; \
  ethtool $n 2>/dev/null | grep -E "Speed:|Port:|Link detected:" | tr '\n' ' '; echo; \
done
eth0   mac=3c:ec:ef:dd:48:56    Speed: 10000Mb/s        Port: Twisted Pair      Link detected: yes 
eth0.1 mac=3c:ec:ef:dd:48:56    Speed: 10000Mb/s        Port: Twisted Pair      Link detected: yes 
eth0.253 mac=3c:ec:ef:dd:48:56          Speed: 10000Mb/s        Port: Twisted Pair      Link detected: yes 
eth0.30 mac=3c:ec:ef:dd:48:56   Speed: 10000Mb/s        Port: Twisted Pair      Link detected: yes 
eth0.42 mac=3c:ec:ef:dd:48:56   Speed: 10000Mb/s        Port: Twisted Pair      Link detected: yes 
eth0.55 mac=3c:ec:ef:dd:48:56   Speed: 10000Mb/s        Port: Twisted Pair      Link detected: yes 
eth1   mac=3c:ec:ef:dd:3d:ba    Speed: Unknown!         Port: Twisted Pair      Link detected: no 
eth2   mac=3c:ec:ef:dd:48:57    Speed: Unknown!         Port: Other     Link detected: no 
eth3   mac=3c:ec:ef:dd:3d:bb    Speed: Unknown!         Port: Twisted Pair      Link detected: no 
eth4   mac=3c:ec:ef:dd:48:58    Speed: Unknown!         Port: Other     Link detected: no 
eth5   mac=3c:ec:ef:dd:48:59    Speed: 10000Mb/s        Port: Direct Attach Copper      Link detected: no 
eth6   mac=3c:ec:ef:dd:3d:bc    Speed: Unknown!         Port: Twisted Pair      Link detected: no 
eth7   mac=3c:ec:ef:dd:3d:bd    Speed: Unknown!         Port: Twisted Pair      Link detected: no 
root@DockOfTheBay:~# 

eth0 is the 10GbT connection and eth5 is the DAC.

Thoughts how to turn it up? I saw some post on a melonox driver but have no reason to think this is mellonox.

Switch side sees Up / connected, 10G full-duplex

Please post the diagnostics to see if there's something there

dockofthebay-diagnostics-20260628-2022.zip

This is definitely a unRAID issue I have two identical servers, one with OPNsense one with unRAID, unRAID will not see the 10GE SFP ports, the other older version, was an unRAID server, never could get the SPF+ to work with unRAID, since I retired it from unRAID put Ubuntu on it, the SFP+ work great.

Jun 13 14:26:47 DockOfTheBay kernel: i40e 0000:b5:00.3 eth5: NIC Link is Up, 10 Gbps Full Duplex, Flow Control: None

Jun 13 14:26:47 DockOfTheBay kernel: i40e 0000:b5:00.3: Added LAN device PF3 bus=0xb5 dev=0x00 func=0x03

Jun 13 14:26:47 DockOfTheBay kernel: i40e 0000:b5:00.3: Features: PF-id[3] VFs: 32 VSIs: 34 QP: 8 RSS FD_ATR FD_SB NTUPLE VxLAN Geneve PTP VEPA

Jun 14 13:32:52 DockOfTheBay kernel: i40e 0000:b5:00.3 eth5: NIC Link is Down

Jun 14 13:33:32 DockOfTheBay kernel: i40e 0000:b5:00.3 eth5: NIC Link is Up, 10 Gbps Full Duplex, Flow Control: None

Jun 14 15:15:46 DockOfTheBay kernel: i40e 0000:b5:00.3 eth5: NIC Link is Down

Jun 14 15:15:54 DockOfTheBay kernel: i40e 0000:b5:00.3 eth5: NIC Link is Up, 10 Gbps Full Duplex, Flow Control: None

Jun 24 18:06:44 DockOfTheBay kernel: i40e 0000:b5:00.3 eth5: NIC Link is Down

Link is initially up, but then it keeps going up and down.

correct, that is the symptom of unRAID not supporting this.

This is a simple AB Test, tried 5 DAC Cables, one Fiber cable 4 switches, changed the OS and it works.

Not sure what you mean; the link was up for many hours.