174 lines
5.9 KiB
Groff
174 lines
5.9 KiB
Groff
.\" $NetBSD: hp.4,v 1.7 1999/03/16 01:19:24 garbled Exp $
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.\"
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.\" Copyright (c) 1991, 1993, 19801988
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)hp.4 8.1 (Berkeley) 6/5/93
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.\"
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.Dd June 5, 1993
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.Dt HP 4 vax
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.Os
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.Sh NAME
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.Nm hp
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.Nd
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.Tn MASSBUS
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disk interface
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.Sh SYNOPSIS
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.Cd "hp0 at mba0 drive 0"
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.Cd "hp* at mba? drive ?"
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.Sh DESCRIPTION
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The
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.Nm hp
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driver
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is a generic Massbus disk driver which handles the standard
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.Tn DEC
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controllers.
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It is typical of a block-device disk driver; block
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.Tn I/O
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is
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described in
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.Xr physio 4 .
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.Pp
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The script
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.Xr MAKEDEV 8
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should be used to create the special files; if a special file
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needs to be created by hand consult
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.Xr mknod 8 .
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It is recommended as a security precaution to not create special files
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for devices which may never be installed.
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.Pp
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The first sector of each disk contains both a first-stage bootstrap program
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and a disk label containing geometry information and partition layouts (see
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.Xr disklabel 5 .
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This sector is normally write-protected, and disk-to-disk copies should
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avoid copying this sector.
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The label may be updated with
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.Xr disklabel 8 ,
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which can also be used to write-enable and write-disable the sector.
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The next 15 sectors contain a second-stage bootstrap program.
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.Sh DISK SUPPORT
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During autoconfiguration or whenever a drive comes on line for the first time,
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or when a drive is opened after all partitions are closed,
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the first sector of the drive is examined for a disk label.
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If a label is found, the geometry of the drive and the partition tables
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are taken from it.
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If no label is found, a fake label is created by the driver, enough
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so that a real label can be written.
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.Pp
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The hp?a partition is normally used for the root file system,
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the hp?b partition as a paging area,
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and the hp?c partition for pack-pack copying (it maps the entire disk).
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On disks larger than about 205 Megabytes, the hp?h partition
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is inserted prior to the hp?d or hp?g partition;
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the hp?g partition then maps the remainder of the pack.
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.Pp
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.Sh FILES
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.Bl -tag -width /dev/rhp[0-7][a-h] -compact
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.It Pa /dev/hp[0-7][a-h]
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block files
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.It Pa /dev/rhp[0-7][a-h]
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raw files
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.El
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "hp%d%c: hard error %sing fsbn %d [of %d-%d] (hp%d bn %d cn %d tn %d sn %d) mbsr=%b er1=%b er2=%b."
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An unrecoverable error occurred during transfer of the specified
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filesystem block number,
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which is a logical block number on the indicated partition.
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If the transfer involved multiple blocks, the block range is printed as well.
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The parenthesized fields list the actual disk sector number
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relative to the beginning of the drive,
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as well as the cylinder, track and sector number of the block.
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The
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.Tn MASSBUS
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status register is printed in hexadecimal and
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with the error bits decoded if any error bits other than
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.Tn MBEXC
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and
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.Tn DTABT
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are set. In any case the contents of the two error registers are also printed
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in octal and symbolically with bits decoded.
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(Note that er2 is what old
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.Tn RP06
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manuals would call
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.Tn RPER3 ;
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the terminology
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is that of the
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.Tn RM
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disks).
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The error was either unrecoverable, or a large number of retry attempts
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(including offset positioning and drive recalibration) could not
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recover the error.
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.Pp
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.It "hp%d%c: soft ecc reading fsbn %d [of %d-%d] (hp%d bn %d cn %d tn %d sn %d)."
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A recoverable
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.Tn ECC
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error occurred on the
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specified sector of the specified disk partition.
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If the transfer involved multiple blocks, the block range is printed as well.
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The parenthesized fields list the actual disk sector number
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relative to the beginning of the drive,
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as well as the cylinder, track and sector number of the block.
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This happens normally
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a few times a week. If it happens more frequently than
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this the sectors where the errors are occurring should be checked to see
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if certain cylinders on the pack, spots on the carriage of the drive
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or heads are indicated.
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.Pp
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.El
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.Sh SEE ALSO
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.Xr physio 4 ,
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.Xr up 4 ,
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.Xr disklabel 5 ,
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.Xr MAKEDEV 8
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.Xr disklabel 8
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.Xr mknod 8
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.Sh HISTORY
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The
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.Nm
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driver appeared in
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.Bx 4.0 .
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.br
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A new
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.Nm
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driver showed up in
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.Nx 1.2 .
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.Sh BUGS
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.Tn DEC Ns -standard
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.Xr bad144 8
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bad-block handling should be used.
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.Pp
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.Tn DEC Ns -standard
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error logging should be supported.
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.Pp
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A program to analyze the logged error information (even in its
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present reduced form) is needed.
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