HP A6795A Installation Manual page 14

HP-UX Installation
Interpreting Hardware Paths
Field Value Information
Domain The value depends
on the Fibre
Channel topology of
the HBA.
Area The value depends
on the Fibre
Channel topology of
the HBA.
Port The value depends
on the Fibre
Channel topology of
the HBA and the
target device, and on
the LUN addressing
method used.
Bus The value depends
on the Fibre
Channel topology of
the HBA and the
target device, and on
the LUN addressing
method used.
14
Fibre Channel Topology of HBA
Fabric Topologies such as Public
Loop and Direct Fabric Attach
This field is typically the Domain ID
of the switch to which the target
device is attached. The value of
this field is taken from the most
significant byte of the N_Port ID of
the target device.
This field is taken 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. How this encoding is
done depends on the switch. Consult
the relevant switch manual to
interpret this field.
For LUNs with Peripheral Device
Addressing, the value of this field is
always 255.
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 least
significant byte of the N_Port ID of
the target device.
For LUNs with Logical Unit Addressing, the value is the Bus Number
field of the Logical Unit Number.
For LUNs with Volume Set Addressing (Flat Space Addressing), the
value is bits 7 - 13 of the Logical Unit Number
Private Loop
This field is set to 8.
For historical reasons, 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; doing so is
unsupported and will not work.
This field is set to 0.
For LUNs with Peripheral Device
Addressing, the value of this field
is always 255.
For other LUN methods, the
value of this field is 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 Loop
ID of the target device.
Chapter 1