Seagate Fibre Channel Interface User Manual
Page 191
Fibre Channel Interface Manual, Rev. D
177
Page Length
The length (in bytes) of the Device Identification page. If the allocation length is too small to transfer all the page, the page
length is not adjusted to reflect the truncation.
Peripheral Qualifier and Peripheral Device Type
00h
A direct-access device (magnetic disc) is connected to this logical unit.
Each identification descriptor contains information identifying the logical unit. If the logical unit is accessible
through any other path, it returns the same identification.
Field definitions (listed alphabetically)
Association
This field specifies the entity that the Identifier field is associated with.
00h
Associated with the addressed physical or logical device.
01h
Associated with the port that received the request.
02 - 03h
Reserved.
Code Set
This field specifies the code set used for the identifier field. This field is an aid to software that displays the identifier field.
00h
Reserved.
01h
The Identifier field contains binary values.
02h
The Identifier field contains ASCII graphic codes (i.e., code values 20h through 7Eh)
03 - 0Fh
Reserved
Identifier
This field contains the identifier as described by the Identifier Type, Code Set, and Identifier Length fields.
Identifier Length
This field specifies the length, in bytes, of the Identifier.
Note.
If the command descriptor block’s allocation length is too small to transfer all of the identifier, the Identifier Length
is not adjusted to reflect the truncation.
Identifier Type
This field specifies the format and assignment authority for the identifier.
00h
No assignment authority was used and, consequently, there is no guarantee that the identifier is globally
unique (the identifier is vendor-specific).
01h
The first eight bytes of the Identifier field contain the Vendor ID. The organization associated with the Vendor
ID is responsible for ensuring that the remainder of the Identifier field is unique. One recommended method
Table 112: Identification Descriptor structure
Bit
Byte
7
6
5
4
3
2
1
0
0
Reserved
Code Set
1
Reserved
Association
Identifier Type
2
Reserved
3
Identifier Length (n - 3)
4
(MSB)
:
Identifier
n
(LSB)
Table
number