Possible cause for link disconnected in your output:
If an FCP adapter is in a 'LINK DISCONNECTED' state, it means the adapter was taken down due to a fibre channel link offline event. The link is still physically connected. This condition should recover once the issue that caused the offline event is cleared, but can require manual intervention in some cases.
Attempt a bounce of the connected port from the fabric switch side, then re-assess connection:
Cisco Example:
switch# config terminal
switch(config)# interface fc<slot/port #>
switch(config-if)# shutdown
switch(config-if)# no shutdown
Brocade Example:
switch:admin> portdisable <index # OR slot/port #>
switch:admin> portenable <index # OR slot/port #>
If issue persists and port does not come online, physical inspection and re-seat of cable and SFPs on both ends may be required. Repeat the port bounce process after re-seat. If issue still persists, please contact NetApp Technical Support and reference this article for further assistance.
Courtesy:
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Systems/FAS_Systems/FCP_target_adapter_showing_'LINK_DISCONNECTED'_after_'scsitarget.isp...