96-277r1 - Proposed Change in QErr for SPC-2

Gene Milligan Gene_Milligan at notes.seagate.com
Mon Mar 3 08:31:36 PST 1997

* From the SCSI Reflector (scsi at symbios.com), posted by:
* Gene Milligan <Gene_Milligan at notes.seagate.com>
>First and foremost, I want a standard that does not give its readers the
>impression that something works, when in fact, it does not work at all. 
>The current SPC text does this in the definition of QErr=1 behavior.
>QErr=1 (or as proposed in 96-277r1, QErr=01) does not work in multi-
>initiator systems. 

 As far as I know this is an erroneous assertion. I think we will need to talk 
it through in the working group. The definition was insisted upon by one of the 
earliest implementors of multi-initiator SCSI systems. I have the impression 
that Ralph's discussion is from the perspective of SCSI only communication 
between the initiators and/or from the perspective of non-cooperating 
initiators. The behavior I think was to take the place of ECA and to stop 
continued operation until the serious error software resources could be 

 Systems that are not benefited by QErr=1 and more importantly are disrupted by 
the behavior (assuming they have not succumbed to the original error) simply 
should not set QErr=1. After all if it hurts, stop doing it.

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