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Date:      Wed, 08 Jan 1997 09:17:53 -0700
From:      Sean Kelly <kelly@fsl.noaa.gov>
To:        Stefan Esser <se@freebsd.org>
Cc:        scsi@freebsd.org
Subject:   Re: Problem appears from  migration from bt0 to ncr0
Message-ID:  <32D3C8B1.EDA@fsl.noaa.gov>
References:  <32D125EB.4E3F@fsl.noaa.gov> <Mutt.19970106205850.se@x14.mi.uni-koeln.de> <32D15EA6.47A0@fsl.noaa.gov> <Mutt.19970106212906.se@x14.mi.uni-koeln.de>

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Stefan:

Here're the results so far with the DFRS drive of doom.  

First, with the system running 2.1.5R, I modified /sys/scsi/sd.c and
changed xs->timeout from 10000 to 80000.  Later that evening, the DFRS
went to sleep but the same problem occurred as before.  Perhaps I
should've used a higher value?  (And if what I changed wasn't correct,
do let me know.)

Next, I upgraded to 2.2-BETA, and ran the system with an unmodified
sd.c.  This time, the system locked up (!) when the DFRS went to sleep. 
The console displayed:

ncr0: SCSI phase error fixup: CCB already dequeued (...)

and the scrollback buffer worked, and I could enter my account name at
the login prompt.  But nothing else; as if any activity requiring the
disk just hung.  I hit the reset switch.

I still need to try changing the xs->timeout in the 2.2-BETA kernel and
forcing the tape drives to be async in /etc/rc.local.

Thanks for your help so far!

-- 
Sean Kelly                          
NOAA Forecast Systems Laboratory    kelly@fsl.noaa.gov
Boulder Colorado USA                http://www-sdd.fsl.noaa.gov/~kelly/



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