Disabled SAS Expander Port

Gil Romo gil.romo at qlogic.com
Wed Nov 19 11:21:39 PST 2003

* 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 

Is this the expected behavior?  What would be the expander's response if it did 
not include a "subtractive" port.

Gilbert Romo
Circuits & Integration
QLogic Corporation, Aliso Viejo, California
Office: 949-389-6266
E-mail: gil.romo at qlogic.com

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