SAS OOB and Expanders

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


* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <Elliott at hp.com>
*
> -----Original Message-----
> From: Kevin_Marks at Dell.com [mailto:Kevin_Marks at Dell.com] 
> Sent: Monday, April 14, 2003 6:59 PM
> To: t10 at t10.org
> Subject: SAS OOB and Expanders
>
> In Section 6.5, the last sentence states "Expander devices shall not
forward
> OOB signals. An expander device shall run the link reset sequence
independently 
> 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
then 
> 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
expander
does not do anything to its other physical links.

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


> Kevin Marks ( Kevin_Marks at Dell.com )
> Product Group, Enterprise 

-- 
Rob Elliott, elliott at hp.com 
Hewlett-Packard Industry Standard Server Storage Advanced Technology 
https://ecardfile.com/id/RobElliott 

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