Subject: AWT reset to zero
Date: Fri, 3 Oct 2008 11:07:12 -0700
From: "Marian Lakov" <Marian_Lakov@us.xyratex.com>
To: <t10@t10.org>
X-Message-Number: 9170
Formatted message: HTML-formatted message

Hi,
Does an Open Reject (Pathway Blocked) response coming from an upstream
expander reset the AWT back to default (zero)? My understanding based on
Note 48 is that only Open Reject (Retry) shall reset the AWT in this
situation.
7.12.3 Arbitration fairness
SAS supports least-recently used arbitration fairness for connection
requests.
...
A SAS port shall stop the Arbitration Wait Time timer and set it to zero
when it has no more frames to send.
A SAS port shall stop the Arbitration Wait Time timer and set it to zero
when it receives one of the following connection responses:
a) OPEN_ACCEPT;
b) OPEN_REJECT (PROTOCOL NOT SUPPORTED);
c) OPEN_REJECT (RESERVED ABANDON 1);
d) OPEN_REJECT (RESERVED ABANDON 2);
e) OPEN_REJECT (RESERVED ABANDON 3);
f) OPEN_REJECT (STP RESOURCES BUSY);
g) OPEN_REJECT (WRONG DESTINATION);
h) OPEN_REJECT (RESERVED CONTINUE 0);
i) OPEN_REJECT (RESERVED CONTINUE 1); or
j) OPEN_REJECT (RETRY).
NOTE 48 - Connection responses that are conclusively from the
destination phy (see table 110 and table 111 in 7.2.5.13) are included
in the list. Except for OPEN_REJECT (RETRY), connection responses that
are only from or may be from expander phys are not included.
Thanks,
Marian
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