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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 Area Port Bus Target LUNDomain
0/1/2/0.1.19.255.0.0.0
Example 2-2 Hardware Path for a Private Loop Device
Adapter Area Port Bus Target LUNDomain
0/1/2/0.8.0.255.0.1.0
Table 2-3 describes each field in the hardware path.
Table 2-3 Hardware Path Field Descriptions
Fibre Channel Topology of HBA
ValueField
Private LoopFabric Topologies
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.
Adapter
8: HP-UX uses a Domain ID of 8 to
indicate private loops. Fibre Channel
switches seen by HP-UX hosts cannot
be configured with domain ID of 8.
Typically the Domain ID of the switch to
which the target device is attached, taken
from the most significant byte of the
N_Port ID of the target device.
Dependent on the Fibre
Channel topology of the
HBA.
Domain
0Taken from the second byte of the N_Port
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.
Depends on the Fibre
Channel topology of the
HBA.
Area
For LUNs with Peripheral Device Addressing, the value of this field is always
255.
Depends on the Fibre
Channel topology of the
HBA and the target
device, and on the LUN
addressing method
used.
Port
For other LUN methods, the value of
this field is the Loop ID of the target
device.
For other LUN methods, the value of this
field is the least significant byte of the
N_Port ID of the target device.
For LUNs with Peripheral Device
Addressing, the value of this field is
the upper 4-bits of the Loop ID of the
target device.
For LUNs with Peripheral Device
Addressing, the value of this field is the
upper 4 bits of the least significant byte
of the N_Port ID of the target device.
Depends on the Fibre
Channel topology of the
HBA and the target
device, and on the LUN
addressing method
used.
Bus
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