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From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com>
Message-Id: <199608030603.XAA03769@GndRsh.aac.dev.com>
Subject: Re: Parity errors during install
To: frankd@yoda.fdt.net (Frank Seltzer)
Date: Fri, 2 Aug 1996 23:03:07 -0700 (PDT)
Cc: freebsd-hardware@freebsd.org
In-Reply-To: <Pine.BSI.3.95.960803010238.17403B-100000@Kryten.nina.com> from Frank Seltzer at "Aug 3, 96 01:23:21 am"
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> Hi All,
> 
> I am having trouble installing 2.1.0 on a new machine. The hardware
> consists of:
> 
> 	Asus P6NP5 Pentium Pro 200 MB
> 	64 MB RAM
> 	Adaptec 2940 SCSI controller
> 	Micropolis 4421 2.1 GB SCSI drive
> 	HP 1536 DAT tape
> 	Texel 3024 SCSI CD (~3 years old - the only old part)
> 	#9 Motion 771 video card with 4 MB
> 
> I am getting the following error quite often when installing or copying
> from the CD to the hard drive:
> 
> 	sd0(ahc0:0:0) ABORTED COMMAND acs:47,0 SCSI parity error
> 
> I have (after 12 hours of attempting installs trying different settings) a
> very fragile installation. I have tried moving the SCSI devices around on
> the bus, setting up a small DOS partition and almost every setting option
> on the Adaptec. During install, I get these parity errors repeatedly at
> varying places. After ~10-20 errors the computer will lock up for about 1
> minute and then reboot.
> 
> Does anyone have any ideas about what to try next? I am too foggy right
> now to think straight.

Is your scsi bus properly terminated? 

What kind of condition is your SCSI cable in?

Ribbon cables get worn out quickly when connected and disconnected 
(about 10 to 15 cycles and they are really trashed as far as the
connector goes.)


-- 
Rod Grimes                                      rgrimes@gndrsh.aac.dev.com
Accurate Automation Company                 Reliable computers for FreeBSD