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From: Andrew Heybey <ath@bellcore.com>
To: questions@freebsd.org, scsi@freebsd.org
Subject: NCR 53c810 & DAT tape
Date: Thu, 16 Oct 1997 16:20:22 -0400
Sender: owner-freebsd-scsi@freebsd.org
X-Loop: FreeBSD.org
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So after I post about the wonders of my new SCSI controller & DAT
drive, then I run into a problem.

I try to do a large dump on the drive (about 300 MB), and it dies
after 26340 tape blocks with a write error, and the drive wedges with
both LEDs on.  By "wedged" I mean that it doesn't respond to pushing
the eject button, dump is stuck in a disk wait, and an attempt to make
something happen by causing a reprobe ("scsi -f /dev/rst0.ctl -p")
also hangs in a disk wait.

Log messages after the error were:

ncr0:6: ERROR (a0:0) (a-2a-0) (48/13) @ script (1bc:7c094800).
ncr0: script cmd = 900b0000
ncr0: regdump: da 10 80 13 47 48 06 1f 01 0a 86 2a 80 00 0a 00.
ncr0: restart (fatal error).
st0: COMMAND FAILED (9 ff) @f064ea00.
ncr0: timeout ccb=f064ea00 (skip)

Boot-time probe messages for the machine, tape & controller are:

FreeBSD 3.0-970807-SNAP #0: Thu Aug  7 09:39:34 GMT 1997
    root@make.ican.net:/usr/src/sys/compile/GENERIC
CPU: Pentium (232.96-MHz 586-class CPU)
  Origin = "GenuineIntel"  Id = 0x543  Stepping=3
  Features=0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,MMX>
ncr0: <ncr 53c810 fast10 scsi> rev 0x01 int a irq 9 on pci0.10.0
ncr0: minsync=25, maxsync=206, maxoffs=8, 16 dwords burst, normal dma fifo
ncr0: waiting for scsi devices to settle
scbus0 at ncr0 bus 0
st0 at scbus0 target 6 lun 0
st0: <ARCHIVE Python 25501-XXX 5.45> type 1 removable SCSI 2
st0: Sequential-Access 
st0: 6.7 MB/s (150 ns, offset 8)
density code 0x13,  drive empty

The tape drive is the only thing on the bus.  It is not clear to me
from the log messages whether the error is from the tape drive or some
kind of problem with the controller.  Any hints?

thanks,
andrew