Fw: Proposal for IEEE company_id based formats for FC-PH world-wideidentifiers

Edward A. Gardner gardner at acm.org
Thu Dec 19 08:17:14 PST 1996

* From the SCSI Reflector (scsi at symbios.com), posted by:
* "Edward A. Gardner" <gardner at acm.org>
Larry Chen <larryc at maxstrat.com> wrote:

> In the RAID controller case, the virtual LUNs' WWNs are not
> the same as its RAID controller node's WWN and can not be
> associated as easily as the simple disk drive case. 
> I had hoped to get a general mechanism that could be used
> at the SCSI level to associate any old LUN's WWN with its Node's
> WWN (i.e., virtual LUNs' WWNs with its RAID controller node's 
> WWN).
> I was ready to go to Dallas and make a formal proposal but
> fortunately, Bob Snively mentioned that I could use the 
> 24-bit company_id and 36-bit Vendor Specified Identifier 
> fields from the virtual LUN's WWN in IEEE registered 
> extended format to get a pseudo WWN (60-bits only) for its RAID 
> controller node instead.

Could you be more specific about what you are talking about in the last
paragraph?  It sounds suspiciously like you're planning on using knowledge
of the RAID controller's (vendor unique) WWN assignment algorithm to
accomplish your purpose.  Such an approach is insupportable and would be a
major industry mistake.

If this is not what you're talking about, could you please explain just
what your/Snively's scheme is?  Thank you.

Edward A. Gardner               gardner at acm.org
Ophidian Designs                719 593-8866 voice
1262 Hofstead Terrace           719 593-8989 fax
Colorado Springs, CO  80907
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