TAS and Extended Contingent Allegiance

Evans, Mark Mark_Evans at maxtor.com
Wed Sep 22 09:50:37 PDT 2004


* From the T10 Reflector (t10 at t10.org), posted by:
* "Evans, Mark" <Mark_Evans at maxtor.com>
*
Hi Ralph,

I think that the only option is to change the bit to "obsolete".  If someone requires the TAS functionality, then a new bit should be assigned.

Regards,

Mark Evans
Maxtor Corporation

 -----Original Message-----
From: 	owner-t10 at t10.org [mailto:owner-t10 at t10.org]  On Behalf Of Ralph O. Weber
Sent:	Tuesday, September 21, 2004 10:47 AM
To:	T10 Reflector
Subject:	TAS and Extended Contingent Allegiance

* From the T10 Reflector (t10 at t10.org), posted by:
* "Ralph O. Weber" <roweber at ieee.org>
*
It has been brought to my attention that SPC-1 changed
bit 7 of byte 4 in the Control mode page from EECA (Enable
Extended Contingent Allegiance) to Reserved.

In SPC-2, the same bit was changed from Reserved to TAS
(Task Aborted Status).

Apparently, some firmware out there still interprets
Control mode page byte 4 bit 7 to mean Enable Extended
Contingent Allegiance.

Since it seems likely that lots of other firmware interprets
the same bit as enabling the sending of TASK ABORTED status,
there may be a nasty problem brewing here.

All the best,

.Ralph

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