WWPN 全称为World Wide Port Names （世界范围的端口名称）。

使用命令“cat /proc/scsi/scsi”检查连接的scsi设备。
下面的示例显示了连接到此 Linux 系统的 IBM Ultrium 第 6 代 (LTO-6) 磁带驱动器。

# cat /proc/scsi/scsi
Attached devices:
Host: scsi10 Channel: 00 Id: 00 Lun: 00
  Vendor: IBM      Model: ULT3580-TD6      Rev: F9A0
  Type:   Sequential-Access                ANSI  SCSI revision: 06
Host: scsi3 Channel: 00 Id: 00 Lun: 00
  Vendor: IBM      Model: ULT3580-TD6      Rev: F9A0
  Type:   Sequential-Access                ANSI  SCSI revision: 06

# yum install sg3_utils

# sg_map -i -x
/dev/sg2073  12 0 0 0  1  /dev/nst0  IBM       ULT3580-TD6       F9A0
/dev/sg2075  10 0 0 0  1  /dev/nst2  IBM       ULT3580-TD6       F9A0

命令“systool”显示连接到 Linux 系统的磁带设备的 WWPN。
命令“systool”需要安装 libsysfs 和 sysfsutils 包。
如果未安装它们，则需要先安装它们。

# yum install libsysfs
# yum install sysfsutils

# systool -c fc_transport -v
Class = "fc_transport"
    Class Device = "0:0"
  Class Device path = "/sys/devices/pci0000:80/0000:80:02.0/0000:84:00.0/host3/rport-3:0-0/target3:0:0/fc_transport/target3:0:0"
    node_name           = "0x500308c3a30dc094"
    port_id             = "0x511d00"
    port_name           = "0x500308c3a30dc095"
    uevent              = 
    Device = "target3:0:0"
    Device path = "/sys/devices/pci0000:80/0000:80:02.0/0000:84:00.0/host3/rport-3:0-0/target3:0:0"
      uevent              = "DEVTYPE=scsi_target"

  Class Device = "0:0"
  Class Device path = "/sys/devices/pci0000:c0/0000:c0:02.0/0000:c4:00.1/host10/rport-10:0-0/target10:0:0/fc_transport/target10:0:0"
    node_name           = "0x500308c3a30dc0a8"
    port_id             = "0x511b00"
    port_name           = "0x500308c3a30dc0a9"
    uevent              = 
    Device = "target10:0:0"
    Device path = "/sys/devices/pci0000:c0/0000:c0:02.0/0000:c4:00.1/host10/rport-10:0-0/target10:0:0"
      uevent              = "DEVTYPE=scsi_target"