The tw_cli utility for 3ware RAID controllers is broken on 9.3. However the fix is very easy: http://muff.kiev.ua/content/twcli-utilita-upravleniya-raid-kontrollerami-3ware (if you speak little Russian of course) 
Code:
# cd /usr/ports/distfiles
# fetch http://muff.kiev.ua/files/cli_freebsd_10.2.1_9.5.4.zip
# cd /usr/ports/sysutils/tw_cli
# make install clean
# rehash