Disabled SAS Expander Port

Gil Romo gil.romo at qlogic.com
Fri Nov 21 09:05:11 PST 2003


* From the T10 Reflector (t10 at t10.org), posted by:
* Gil Romo <gil.romo at qlogic.com>
*
... the answer to the last question in my previous message:

> What would be the expander's response if it did not include a "subtractive" 
port?

In 7.5.12.2, "If it does not find a match and no subtractive routing phy is 
available, the edge expander device shall reply with OPEN_REJECT (NO 
DESTINATION)."

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> Date: Wed, 19 Nov 2003 11:21:39 -0800 (PST)
> From: Gil Romo <gil.romo at qlogic.com>
> Subject: Disabled SAS Expander Port
> To: t10 at t10.org
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> * From the T10 Reflector (t10 at t10.org), posted by:
> * Gil Romo <gil.romo at qlogic.com>
> *
> 
> Would a SAS device ever attempt to open a connection through a disabled port 
> along the path to another SAS device?
> 
> If the originator-side expander port could not receive the OPEN address frame, 
> the originator would timeout.
> 
> If the responder-side expander port could not forward the OPEN address frame, 
it 
> might be forwarded out the expander's "subtractive" port, resulting in an 
> OPEN_REJECT (WRONG DESTINATION) response.
> 
> Is this the expected behavior?  What would be the expander's response if it 
did 
> not include a "subtractive" port.
> 
> Thanks.
> ------------
> Gilbert Romo
> Circuits & Integration
> QLogic Corporation, Aliso Viejo, California
> Office: 949-389-6266
> E-mail: gil.romo at qlogic.com
> 
> *
> * For T10 Reflector information, send a message with
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------------
Gilbert Romo
Circuits & Integration
QLogic Corporation, Aliso Viejo, California
Office: 949-389-6266
E-mail: gil.romo at qlogic.com

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