HP A6795A Installation Guide - Page 14

Interpreting Hardware Paths, Fibre Channel Topology of HBA

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HP-UX Installation Interpreting Hardware Paths Field Value Information Fibre Channel Topology of HBA Fabric Topologies such as Public Loop and Direct Fabric Attach Private Loop Domain The value depends on the Fibre Channel topology of the HBA. 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 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. Area The value depends on the Fibre Channel topology of the HBA. This field is taken from the second byte of the N_Port ID of the target device. This field is set to 0. 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. Port The value depends For LUNs with Peripheral Device For LUNs with Peripheral Device on the Fibre Addressing, the value of this field is Addressing, the value of this field Channel topology of always 255. is always 255. the HBA and the target device, and on For other LUN methods, the value of For other LUN methods, the the LUN addressing this field is the least significant byte value of this field is the Loop ID method used. of the N_Port ID of the target device. of the target device. Bus The value depends For LUNs with Peripheral Device For LUNs with Peripheral Device on the Fibre Addressing, the value of this field is Addressing, the value of this field Channel topology of the upper 4-bits of the least is the upper 4-bits of the Loop the HBA and the significant byte of the N_Port ID of ID of the target device. target device, and on the target device. the LUN addressing method used. 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 14 Chapter 1

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HP-UX Installation
Interpreting Hardware Paths
Chapter 1
14
Domain
The value depends
on the Fibre
Channel topology of
the HBA.
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 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.
Area
The value depends
on the Fibre
Channel topology of
the HBA.
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.
This field is set to 0.
Port
The value 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 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 always 255.
For other LUN methods, the
value of this field is the Loop ID
of the target device
.
Bus
The value 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
the
upper
4-bits of 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 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
Field
Value Information
Fibre Channel Topology of HBA
Fabric Topologies such as Public
Loop and Direct Fabric Attach
Private Loop