RE: iSCSI: Representing iSCSI devices on FC fabrics

["Elliott, Robert" <Robert.Elliott@compaq.com>]

Correction - the company_id is 24 bits, not 20 bits.

EUI-64 = (MSB) { 24-bit company_id, 
                 40-bit vendor specified } (LSB)

FC WWN = (MSB) { 4-bit NAA field, 
                 24-bit company_id, 
                 36-bit vendor specified } (LSB)
         (for the IEEE Registered NAA type)


> -----Original Message-----
> From: Elliott, Robert 
> Sent: Friday, November 16, 2001 9:33 AM
> To: ips@ece.cmu.edu
> Subject: RE: iSCSI: Representing iSCSI devices on FC fabrics
> 
> 
> Beware than a FC WWN is not the same as an EUI-64.  They're both based
> on the IEEE OUI/company_id, but the FC WWN uses the 4 most significant
> bits for a "Name Address Authority" field and has 4 fewer 
> bits available
> in the vendor specified portion.
> 
> EUI-64 = (MSB) { 20-bit company_id, 
>                  44-bit vendor specified } (LSB)
> 
> FC WWN = (MSB) { 4-bit NAA field, 
>                  20-bit company_id, 
>                  40-bit vendor specified } (LSB)
>          (for the IEEE Registered NAA type)
> 
> ---
> Rob Elliott, Compaq Server Storage
> Robert.Elliott@compaq.com