Minimum Hot-Plug Timeout?

Sheffield, Robert L robert.l.sheffield at
Thu May 15 14:48:45 PDT 2003

* From the T10 Reflector (t10 at, posted by:
* "Sheffield, Robert L" <robert.l.sheffield at>

SAS-r04 defines the Hot-Plug Timeout at follows:
	500 ms - The maximum time after which an expander phy shall retry an unsuccessful phy reset sequence.

Does this mean that an expander phy may use a value of less than 500 ms for the Hot-plug timeout? Is it possible that an expander phy could retry the phy reset sequence so frequently (e.g., 25 microseconds) that the attached device doesn't have time to respond with COMINIT? Is this a potential point of non-interoperability?

Do SAS Initiator phys and SAS Target phys implement the Hot-plug timeout retry? If so, what is the Hot-plug timeout value for these phys?


Bob Sheffield
Intel Corporation - CH6-333
Storage Components Division (SCD)
5000 W. Chandler Blvd
Chandler, AZ 85226-3699
Phone: 480-554-8597
Fax: 480-554-6617

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