Find WWN’s on RedHat /Cent OS

To find port and node WWN’s while the system is running:

• 2.4.x Kernels
  > cat /proc/scsi/[hba_type]/(n)
  where hba_type is the driver (e.g. lpfc for Emulex) and (n) is the HBA number.
• 2.6.x Kernels:
  > cat /sys/class/scsi_host/host(n)/[port_name|node_name]
  Hosts with multiple HBAs are enumerated via host(n) (e.g host0).

You can use lsmod to determine which driver is in use.

:)