There are several commands to determine the WWN of a Fibre Channel (FC) HBA and their status (online/offline). The post discusses few of the most commonly used methods.
Method 1
To find the HBA cards installed on your system use :
# lspci -nn | grep -i hba 07:00.0 Fibre Channel [0c04]: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA [1077:2532] (rev 02) 07:00.1 Fibre Channel [0c04]: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA [1077:2532] (rev 02)
To check the available HBA ports :
# ls -l /sys/class/fc_host total 0 drwxr-xr-x 3 root root 0 Feb 3 2015 host2 drwxr-xr-x 3 root root 0 Feb 3 2015 host3
To find the state of HBA ports (online/offline) :
# more /sys/class/fc_host/host?/port_state :::::::::::::: /sys/class/fc_host/host2/port_state :::::::::::::: Online :::::::::::::: /sys/class/fc_host/host3/port_state :::::::::::::: Online
To find the WWN numbers of the above ports :
# more /sys/class/fc_host/host?/port_name :::::::::::::: /sys/class/fc_host/host2/port_name :::::::::::::: 0x500143802426baf4 :::::::::::::: /sys/class/fc_host/host3/port_name :::::::::::::: 0x500143802426baf6
Method 2 : Using systool
Another useful command to find the information about HBAs is systool. If not already install, you may need to install the sysfsutils package.
# yum install sysfsutils
To check the available HBA ports :
# systool -c fc_host
Class = "fc_host"
Class Device = "host2"
Device = "host2"
Class Device = "host3"
Device = "host3"
To find the WWNs for the HBA ports :
# systool -c fc_host -v | grep port_name
port_name = "0x500143802426baf4"
port_name = "0x500143802426baf6"
To check the state of the HBA ports (online/offline) :
# systool -c fc_host -v | grep port_state
port_state = "Online"
port_state = "Online"