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Date: Wed, 30 Oct 1996 11:11:56 -0800 (PST)
From: Tony Li <tli@jnx.com>
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To: FreeBSD-gnats-submit@freebsd.org
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Subject: kern/1929: HP C1536A DAT drive errors
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>Number:         1929
>Category:       kern
>Synopsis:       HP C1536A DAT drive errors
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Oct 30 11:20:01 PST 1996
>Last-Modified:
>Originator:     Tony Li
>Organization:
Juniper Networks, Inc.
>Release:        FreeBSD 2.2-CURRENT i386
>Environment:

HP C1536A SCSI DAT drive
Adaptec 2940 Ultra SCSI host adapter
multiple different tapes

>Description:

Since a recent kernel upgrade, the tape drive has consistently failed to
read either existing or newly written tapes.  SCSI errors:

st0(ahc0:3:0): ststart st0(ahc0:3:0): Open complete
st0(ahc0:3:0): 
ststrategy st0(ahc0:3:0): ststart st0(ahc0:3:0): scsi_cmd
st0(ahc0:3:0): scsi_done
st0(ahc0:3:0): calling private err_handler()
st0(ahc0:3:0): private err_handler() returned -1
st0(ahc0:3:0): MEDIUM ERROR info:8000 asc:11,0 Unrecovered read error

This occurs on multiple tapes so we have either a kernel problem or a drive
failure.  We don't have access to a second drive to eliminate the drive
failure case.  As this started coincident with a kernel change....

>How-To-Repeat:

Load any written tape (this takes too long).  Attempt to read the tape.  

>Fix:
>Audit-Trail:
>Unformatted:
Tony Li