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Date:      Sat, 9 Sep 1995 21:20:50 +0200
From:      se@zpr.uni-koeln.de (Stefan Esser)
To:        Jean-Marc Zucconi <jmz@cabri.obs-besancon.fr>
Cc:        current@freebsd.org
Subject:   Re: NCR problem: progress
Message-ID:  <199509091920.AA16534@Sysiphos>
In-Reply-To: Jean-Marc Zucconi <jmz@cabri.obs-besancon.fr> "NCR problem: progress" (Sep  9,  2:16)

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On Sep 9,  2:16, Jean-Marc Zucconi wrote:
} Subject: NCR problem: progress
} Hi,
} 
} I have some new data points :-). I tried several combinations and here
} is the result:
} 
} 1 streamer + Micropolis2210              OK
} 2 streamer + Quantum                     OK
} 3 streamer + Micropolis2210 + Quantum    OK
} 4 streamer + Micropolis4110              crash
} 5 Micropolis4110 alone                   crash

What are the technical characteristics of the 4110 ?

Is it possible that it doesn't implement tagged command 
queues correctly ?

} So it seem that I have a problem with the 4110. However, some of the
} crashes I had did not involve that disk (id#0). One of the crashes
} occured during a backup of id#4 and the 4110 was not mounted. Is it
} possible that this disk generate some noise on the bus?

Possible ... 
Maybe the drive has got an internal terminator that is
enabled by some jumper ?

} I have connected the 4110 to a macintosh (an old SE), formatted it,
} and I currently make reads/writes with this disk. It works without any
} trouble (of course that kind of machine will not stress the scsi bus...)
} I will try to plug the disk to another machine this week-end (I have a
} friend running linux on a 486/33+ 1542B). What if the disk only fails
} with the ncr driver?

If it works with the 1542B and doesn't with the NCR,
that doesn't prove much (except that using the 1542B
would give you a working system :)

The 1542B is limited to 5MHz and doesn't use tagged 
commands, AFAIK ...

You can disable tagged commands for a single target:

# ncrcontrol -t 4 -s tags=0

(sets max. 0 tags (i.e. send no TAG message at all)
for target 4).

Regards, STefan

-- 
 Stefan Esser, Zentrum fuer Paralleles Rechnen		Tel:	+49 221 4706021
 Universitaet zu Koeln, Weyertal 80, 50931 Koeln	FAX:	+49 221 4705160
 ==============================================================================
 http://www.zpr.uni-koeln.de/staff/esser/esser.html	  <se@ZPR.Uni-Koeln.DE>



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