Minimum Hot-Plug Timeout?

[Elliott, Robert (Server Storage)]

* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <Elliott at hp.com>
*
There is a minimum too.  6.6.1 includes:
"Phys shall not originate a phy reset sequence until 10 ms have elapsed
since the previous attempt at running a phy reset sequence"

6.6.5 describes the rules/advice for expanders, initiators, and targets:
expanders shall, initiator should, targets should not use hot-plug
timeouts.

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




> -----Original Message-----
> From: Sheffield, Robert L [mailto:robert.l.sheffield at intel.com] 
> Sent: Thursday, May 15, 2003 4:49 PM
> To: t10 at t10.org
> Subject: Minimum Hot-Plug Timeout?
> 
> 
> * From the T10 Reflector (t10 at t10.org), posted by:
> * "Sheffield, Robert L" <robert.l.sheffield at intel.com>
> *
> All,
> 
> 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?
> 
> Regards,
> Bob
> 
> 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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