Interpreting Hardware Paths

Examples 2-1 and 2-2 illustrate the Fibre Channel hardware path format:

Example 2-1 Hardware Path for a Direct Fabric Attach Device

Adapter Domain Area Port Bus Target LUN

0/1/2/0.1.19.255.0.0.0

Example 2-2 Hardware Path for a Private Loop Device

Adapter Domain Area Port Bus Target LUN

0/1/2/0.8.0.255.0.1.0

Table 2-3describes each field in the hardware path.

Table 2-3 Hardware Path Field Descriptions

Field	Value	Fibre Channel Topology of HBA
Field	Value	Fabric Topologies	Private Loop
		Fabric Topologies	Private Loop
Adapter	The hardware path of the Fibre Channel adapter through which the Logical Unit Number (LUN) is seen.
	For multiport adapters, this field describes a specific port on the adapter.
Domain	Dependent on the Fibre	Typically the Domain ID of the switch to	8: HP-UX uses a Domain ID of 8 to
	Channel topology of the	which the target device is attached, taken	indicate private loops. Fibre Channel
	HBA.	from the most significant byte of the	switches seen by HP-UX hosts cannot
		N_Port ID of the target device.	be configured with domain ID of 8.

Area	Depends on the Fibre
	Channel topology of the
	HBA.

Taken from the second byte of the N_Port 0 ID of the target device. On some switches, the second byte of the N_Port ID encodes the switch port to which the device is connected. The encoding method depends on the switch. See your switch manual to interpret this field.

Port	Depends on the Fibre
	Channel topology of the
	HBA and the target
	device, and on the LUN
	addressing method
	used.

For LUNs with Peripheral Device Addressing, the value of this field is always

255.

For other LUN methods, the value of this	For other LUN methods, the value of
field is the least significant byte of the	this field is the Loop ID of the target
N_Port ID of the target device.	device.

Bus	Depends on the Fibre
	Channel topology of the
	HBA and the target
	device, and on the LUN
	addressing method
	used.

For LUNs with Peripheral Device	For LUNs with Peripheral Device
Addressing, the value of this field is the	Addressing, the value of this field is
upper 4 bits of the least significant byte	the upper 4-bits of the Loop ID of the
of the N_Port ID of the target device.	target device.

For LUNs with Logical Unit Addressing, the value is the Bus Number field of the LUN. For LUNs with Volume Set Addressing (Flat Space Addressing), the value is bits 7 - 13 of the LUN.

18 Fibre Channel Adapter Installation