SAS SP state machine Hot-Plug Timeout timer text

[Jim.Coomes at seagate.com]

* From the T10 Reflector (t10 at t10.org), posted by:
* Jim.Coomes at seagate.com
*
Rob,

This change makes SAS confusing from a target's perspective. 4.4.2 says
targets should not initiate phy reset after the initial time following
power up. Most of the places in the draft are generic about initiating phy
reset such as on loss of sync for 1 msec. We have interpreted 4.4.2 to mean
that targets do not initiate phy reset in these generic cases.

The WG in the past concluded from 4.4.2 that targets did not support
Hot-Plug Timeout. If this change is adopted, each place in the draft where
phy reset is initiated needs to be reviewed to determine if it is
appropriate foe targets and the should not removed from 4.4.2.

Jim


----- Forwarded by Jim Coomes/Seagate on 05/02/2003 01:05 PM -----
                                                                                                                                       
                      "Elliott, Robert                                                                                                 
                      (Server Storage)"        To:       <t10 at t10.org>                                                                 
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* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <Elliott at hp.com>
*
Although the Hot-Plug Timeout timer is mandatory only for expander phys
(it is optional for initiator and target phys), some of the wording in
the SP state machine in sas-r03g makes it appear to be mandatory.

(this is the "re-run OOB every 500 ms if there is no response" timer)

Proposed change:
In both:
6.7.3.2 SP1:OOB_AwaitCOMX state
6.7.3.2.1 State description
and:
6.7.3.3 SP2:OOB_NoCOMSASTimeout state
6.7.3.3.1 State description

Change:
Upon entry into this state, the Hot-Plug Timeout timer shall be
initialized and started.

to:
Upon entry into this state, the Hot-Plug Timeout timer shall be
initialized and started if this phy is:
a) an expander phy; or
b) an initiator phy or target phy implementing the Hot-Plug Timeout
timer.


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



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