A little toolset IBM has provided for checking if SAN port/ FC adapter / cable are broken, it is really handy if you are working remotely.
1. Download efc_power.tar file or request the latest version from IBM support.
Direct Link: efc_power
2. Upload it to the server and untar it.
tar xvf efc_power.tar
3. Add executable permission to efc_power file.
chmod +x efc_power
4. Run the command againt the desired fscsix as root:
TX: 0eda -> 0.3802 mW, -4.20 dBm RX: 0c68 -> 0.3176 mW, -4.98 dBm
The efc_power program to measure the transmit (TX) and RX (receive) strength. They stated it works with most Emulex fiber cards. If a server reports the TX less than -10, then the card is probably bad. If the RX is less than -10, then cabling or the SAN port is probably bad.