SAS-r03g: Partial Pathway Timeout Value

Elliott, Robert (Server Storage) Elliott at
Thu Apr 24 10:32:24 PDT 2003

* From the T10 Reflector (t10 at, posted by:
* "Elliott, Robert (Server Storage)" <Elliott at>

> -----Original Message-----
> From: Gil Romo [mailto:gil.romo at] 
> Sent: Wednesday, April 23, 2003 7:02 PM
> To: t10 at
> Subject: SAS-r03g: Partial Pathway Timeout Value
> 1) NOTE 23 refers to a recommended default partial pathway 
> timeout value.  There should be a reference to NOTE 36 
> where this value is defined as 7us.

Added (see

> 2) states that "An expander phy shall initialize the 
> partial pathway timeout timer to the partial path timeout 
> value reported in the SMP DISCOVER function ...".  However, 
> this value is contained only in an SMP DISCOVER response.  If 
> an edge expander is not required to initiate an SMP DISCOVER 
> request, then it will not receive a response and cannot 
> receive this information.

Changed "reported in" to "it reports in".

The value is owned by that expander phy, not retrieved from some
other expander.  Some other entity can find out what the value
is with DISCOVER (or change it with PHY CONTROL).

> 3) In, units are not stated for PARTIAL PATHWAY 
> TIMEOUT VALUE.  Are units expressed in microseconds and is 
> the allowable range from 0 to 15?

Yes.  The units were mentioned in the PHY CONTROL function for writing 
the value but lacking in the DISCOVER function for reading the value.  

Added "in microseconds"

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

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