SAS, AIP (Normal)

[Elliott, Robert (Server Storage)]

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

> -----Original Message-----
> From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf 
> Of Gil Romo
> Sent: Thursday, March 04, 2004 5:27 PM
> To: t10 at t10.org
> Subject: SAS, AIP (Normal)
> 
> 
> * From the T10 Reflector (t10 at t10.org), posted by:
> * Gil Romo <gil.romo at qlogic.com>
> *
> Hello,
> 
> There is a rule in 7.12.5.1, "Expanders shall transmit an AIP 
> ... within 128 dwords of receiving an OPEN address frame".
> 
> I believe this rule is obsolete, since expanders now wait for 
> a confirmation from the ECM before transmitting AIP.
> 
> Expanders must transmit an AIP such that it is received 
> before the Open Timeout Timer times out.
> 
> ------------
> Gilbert Romo
> Circuits & Integration
> QLogic Corporation, Aliso Viejo, California
> Office: 949-389-6266
> E-mail: gil.romo at qlogic.com

No, the rule hasn't changed.  Any ECM needs to be able to acknowledge
within that time.  

Even before the Arbitrating (Normal) change, it was understood that 
requiring the expander to transmit within 128 dwords was overkill 
for meeting the 1 ms timer.  So is the "shall transmit every 128 
dwords" rule after the first one.  They serve as a reminder that 
the expander is working on the request and isn't hung.  We didn't 
want to worry about any race conditions between 1 ms timers
on both sides, either.

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


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