SAS OOB and Expanders

Elliott, Robert (Server Storage) Elliott at
Tue Apr 15 06:49:49 PDT 2003

* From the T10 Reflector (t10 at, posted by:
* "Elliott, Robert (Server Storage)" <Elliott at>
> -----Original Message-----
> From: Kevin_Marks at [mailto:Kevin_Marks at] 
> Sent: Monday, April 14, 2003 6:59 PM
> To: t10 at
> Subject: SAS OOB and Expanders
> In Section 6.5, the last sentence states "Expander devices shall not
> OOB signals. An expander device shall run the link reset sequence
> on each physical link." Does this mean that if an initiator issues a 
> COMRESET/COMINIT via OOB, that the expander will reset the link and
> reissue the OOB to each Phy connected to the expander, or reset the
link and 
> then nothing more, and SMP PHY CONTROL is use to reset expander
connected Phys

The physical link from the initiator to expander gets reset.  The
does not do anything to its other physical links.

The initiator should not issue an SMP PHY CONTROL function to reset the
physical links after this happens; that's only intended for use if it
those other physical links are broken.  

> Kevin Marks ( Kevin_Marks at )
> Product Group, Enterprise 

Rob Elliott, elliott at 
Hewlett-Packard Industry Standard Server Storage Advanced Technology 

* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at

More information about the T10 mailing list