SAS address in SAS-r03

George Penokie gop at
Tue Dec 3 15:48:31 PST 2002

* From the T10 Reflector (t10 at, posted by:
* George Penokie <gop at>


Actually a disk will have four WWIDs; one for each port, one for the target
device, and one for the logical unit.
An expander port in not a SCSI port and does not have it's own WWID. An
expander device only has one WWID (unless it contains targets or initiators
that is).

Bye for now,
George Penokie

Dept 2C6  114-2 N212
E-Mail:    gop at
Internal:  553-5208
External: 507-253-5208   FAX: 507-253-2880

                      "Dennis Moore"                                                                                             
                      <dmoore at ix.netcom        To:       <t10 at>                                                           
                      .com>                    cc:                                                                               
                      Sent by:                 Subject:  SAS address in SAS-r03                                                  
                      owner-t10 at                                                                                          
                      12/03/2002 04:32                                                                                           

In clause 4.2.1 it states that world wide names are unique for devices AND
ports within the transport protocol. I interpret this to mean a disk with
two ports will have three WWNs. One for the device and one for each of its
In clause 4.6.2 third paragraph it states that in an expander there can be
an expander device and within it three ports all sharing the same WWN.
Is my interpretation correct?
If so, isn't 4.6.2 a contradiction of 4.2.1?
dmoore at

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