Proposal for IEEE company_id based formats for FC-PH world-wide identifiers

Larry Chen larryc at
Tue Dec 17 13:00:35 PST 1996

* From the SCSI Reflector (scsi at, posted by:
* Larry Chen <larryc at>
Hi Bob,

Everything in your proposal and tutorial is great except
there is no way to associate the device server with the node
in the RAID controller/lun case.

I have just two comments:
1. device server should be changed to node.
2. add device server and node association feature.

Identification Descriptor - Association field
Value		Description
2		The Identifier field is associated with the node
		that received the request.

Is there room to get these two comments into your work?

Best Regards,

On Thu, 12 Dec 96 11:23:28 PST  Larry Chen wrote:
>Hi Bob,
>Thanks for your reply. I am extremely pleased to see
>all the hard work being done in this area. Hopefully,
>we can put this baby to rest once and for all.
>You wrote in "Draft tutorial for IEEE company_id based SCSI
>identifiers" that the Fibre Channel login process normally
>provides an identification of the device server and port using
>one of the IEEE Fibre Channel formats.
>I think device server should be replaced with node in the
>above statement.
>Could a RAID controller use the IEEE Registered Extended
>WWN without the Vendor Specified Indentifier Extension
>for its node name in the Fibre Channel login process ?
>I agree that the RAID controller's virtual devices 
>should use the IEEE Registered Extension WWN with the 
>Vendor Specified Identifier Extension at the SPC level.
>Thanks for your time and consideration in this matter.
>On Thu, 12 Dec 1996 09:57:55 -0800  Bob Snively wrote:
>>>From larryc at Wed Dec 11 20:59:29 1996
>>>Date: Wed, 11 Dec 96 20:49:12 PST
>>>Subject: RE: Proposal for IEEE company_id based formats for FC-PH world-wide 
>>>To: scsi at, Bob Snively <bob.snively at Eng>
>>>I believe the SPC/SPC-2 document needs to be changed 
>>>to reflect the 128-bit IEEE registered extended format.
>>>Table 113 - Identifier type
>>>value		description
>>>4		The identifier field contains a FC-PH
>>>		128-bit Name_Identifier field as defined
>>>		in ..... In this case, the identifier length
>>>		shall be set to 16.
>>Fortunately, the SCSI definition includes a length field.  As a
>>result, you can simply use length field and the identifier of 3
>>to specify that the format is FC-PH, but that the length is 16 bytes.
>>The FC-PH NAA then defines for you the precise format of those
>>The length field is properly defined in the SPC document, but in
>>some parts of the document is mis-named "page length".
>>For reference, see SPC rev 11, page 125, table 109, byte 3.
>Larry Chen                 Tel: 408.383.1600 (x116)
>Maximum Strategy, Inc.     Fax: 408.383.1616
>801 Buckeye Court       E-mail: larryc at
>Milpitas, CA 95035

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