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From: John Hay <jhay@mikom.csir.co.za>
Message-Id: <199507301835.UAA26628@zibbi.mikom.csir.co.za>
Subject: Re: SCSI Tape bug.
To: ras@nimh.jkcg.com (Robert A. Sharp)
Date: Sun, 30 Jul 1995 20:35:09 +0200 (SAT)
Cc: roberto@blaise.ibp.fr, apollo@io.org, bugs@freebsd.org
In-Reply-To: <Pine.BSF.3.91.950730142102.22288B-100000@nimh.jkcg.com> from "Robert A. Sharp" at Jul 30, 95 02:25:04 pm
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> 	Here's something a little even more puzzling...  Whether I have a 
> tape in the drive or not, I begin with this error message and can never 
> even use the tape drive:
> 
> 	tar -tvf /dev/nrst0
> 	tar: read error on /dev/nrst0 : Input/output error
> 
> 	or:
> 
> 	tar -tvf /dev/rst0 
> 	tar: read error on /dev/rst0 : Input/output error
> 
> 
> 	For reference, here is my hardware configuration:
> 
> ahb0: reading board settings, int=11
> ahb0 at 0x4000-0x40ff irq 11 on eisa slot 4
> (ahb0:0:0): "MICROP 3243-19MZ  Q4D HT02" type 0 fixed SCSI 2
> sd0(ahb0:0:0): Direct-Access 4095MB (8388315 512 byte sectors)
> sd0(ahb0:0:0): with 3956 cyls, 19 heads, and an average 111 sectors/track
> (ahb0:1:0): "IMPRIMIS 94601-15 4614" type 0 fixed SCSI 1
> sd1(ahb0:1:0): Direct-Access 992MB (2031705 512 byte sectors)
> sd1(ahb0:1:0): with 1931 cyls, 15 heads, and an average 70 sectors/track
> (ahb0:4:0): "TANDBERG  TDC 4100 =04Y" type 1 removable SCSI 2
> st0(ahb0:4:0): Sequential-Access density code 0x0,  drive empty
> 
> 
> 	The adaptec is a 274x running in Enhanced mode.  Another 
> interesting note is that I cannot get my Seagate Imprimis (Wren) to Fdisk 
> or disklabel so that I may newfs the drive...??!!  But the tape drive 
> problem is a real pain in the a$$.  If anyone has any thoughts on this, 
> I'd be happy to see this problem leave....
> 

I have a TANDBERG 3800 and I have to set its blocksize and density before it
works. I have the following lines in my rc.local.

mt -f /dev/st0ctl.0 blocksize 512
mt -f /dev/st0ctl.0 density 0x11

I hope this helps.

-- 
John Hay -- jhay@mikom.csir.co.za