The FC ports, if they are installed, are configured as initiators by default. You will need to reconfigure them to target mode.
Use these commands:
filer1> fcadmin config -d 1a
filer1> fcadmin config -d 1b
filer1> fcadmin config -t target 1a
filer1> fcadmin config -t target 1b
filer1> fcadmin config -e 1a
filer1> fcadmin config -e 1b
filer2> fcadmin config -d 1a
filer2> fcadmin config -d 1b
filer2> fcadmin config -t target 1a
filer2> fcadmin config -t target 1b
filer2> fcadmin config -e 1a
filer2> fcadmin config -e 1b