User's Guide

22 SCSI Commands
Protocol Identifier – The PROTOCOL IDENTIFIER field may indicate the SCSI transport protocol to which
the identifier type applies. If the ASSOCIATION field contains a value other than 01b (i.e., target port) or
10b (i.e., SCSI target device) or the PIV bit is set to zero, then the PROTOCOL IDENTIFIER field contents
are reserved. If the ASSOCIATION field contains a value of 01b or 10b and the PIV bit is set to one, then
the PROTOCOL IDENTIFIER field shall contain one of the values shown below to indicate the SCSI
transport protocol to which the identifier type applies.
• 0h – Fibre Channel
• 1h – Parallel SCSI
• 2h – SSA
• 3h – IEEE 1394
• 4h – SCSI Remote Direct Memory Access Protocol
• 5h – Internet SCSI (iSCSI)
• 6h – SAS Protocol Layer
• 7h – Automation/Drive Interface Transport Protocol
• 8h – AT Attachment Interface (ATA/ATAPI)
• 9h to Eh – Reserved
• Fh – No specific protocol
Code Set – This field returns the following values:
• 1h – the Identifier field contains binary values
• 2h – the Identifier field contains ASCII characters
PIV – A protocol identifier valid (PIV) bit set to zero indicates the PROTOCOL IDENTIFIER field contents
are reserved. If the ASSOCIATION field contains a value of 01b or 10b then a PIV bit set to one indicates
the PROTOCOL IDENTIFIER field contains a valid protocol identifier. If the ASSOCIATION field contains a
value other than 01b or 10b, then the PIV bit contents are reserved.
Association – This field returns the following values:
• 0h – the Identifier field is associated with the address physical or logical device
• 1h – the Identifier field is associated with the port that received the request
Identifier Type – This field returns the following values:
• 1h – The identifier is a concatenation of the Vendor Identification field from the Standard Inquiry
response and the Serial Number field (without the Vendor Identification prefix) from the Unit Serial
Number page.
• 3h – The identifier is an IEEE Registered format Name_Identifier (Worldwide Name).
• 4h – The identifier is a port number. In this case, the Code Set and Association fields will both be
set to 1.
Identifier Length – This is the length of the Identifier field, and will vary by identifier type.
Identifier – This is the identifier as described by the Code Set, Association, and Identifier Type fields.
Identification Descriptors
The media changer logical unit will only return the T10 Device Identification Descriptor (type 1h) and the
NAA Device Identification Descriptor (type 3h). The data transfer element hosting the interface will add a
NAA Port Identification Descriptor (type 3h), and a Relative Target Port Identifier (type 4h).