141 lines
4.6 KiB
Groff
141 lines
4.6 KiB
Groff
.\" $NetBSD: edahdi.1,v 1.1.1.1 1996/05/16 19:53:00 leo Exp $
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.\"
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.\" Copyright (c) 1996 Leo Weppelman
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.\" 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 Leo Weppelman
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 16, 1996
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.Dt EDAHDI 1
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.Os
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.Sh NAME
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.Nm edahdi
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.Nd modify AHDI partition identifiers
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.Sh SYNOPSIS
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.Nm edahdi
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.Ar device
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.Sh DESCRIPTION
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.Nm edahdi
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Allows you to modify the partition identifiers on a disk partitioned with
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AHDI or an AHDI compatible formatter. An AHDI partition format is usually
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only present on disks shared between NetBSD and some other OS. The partition
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identifiers are used by NetBSD as a guideline to emulate a disklabel on such
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a disk.
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.Pp
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.Nm edahdi
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supports the following options:
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.Pp
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.Bl -tag -width device
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.It Ar device
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The name of the raw device you want to edit.
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.El
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.Pp
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The following partition identifiers are recognized by NetBSD:
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.Pp
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.Bl -tag -width "GEM or BGM" -compact
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.It NBD
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Partition is reserved for NetBSD. This can be either a root or an user
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partition. The first NBD partition on a disk will be mapped to partition
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.Em a
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in NetBSD. The following NBD partitions will be mapped from
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.Em d
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up.
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The filesystem type is ffs by default.
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.It SWP
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The first SWP partition is mapped to partition
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.Em b.
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.It GEM or BGM
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These partitions are mapped from
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.Em d
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up. The filesystem type is msdos.
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.It NBR
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NetBSD root partition (depricated).
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.It NBU
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NetBSD user partition (depricated).
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.It NBS
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NetBSD swap partition (depricated).
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.El
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.Sh EXAMPLES
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Say, you have a disk with that is partitioned like:
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.Pp
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.Bl -column header Number Id
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.Sy "Number Id"
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1 GEM
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2 GEM
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3 GEM
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4 GEM
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.El
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.Pp
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This partitioning will show up in NetBSD as (Number refers to the first table):
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.Pp
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.Bl -column header "Partition Fstype Number"
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.Sy "Partition Fstype Number"
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c (whole disk) unused
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d (user part) MSDOS 1
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e (user part) MSDOS 2
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f (user part) MSDOS 3
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g (user part) MSDOS 4
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.El
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.Pp
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Now you decide to change the id of partition 2 and 3 to NBD. Now NetBSD
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will show the partitioning as (Number refers to the first table):
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.Pp
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.Bl -column header "Partition Fstype Number"
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.Sy "Partition Fstype Number"
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a (root) 4.2BSD 2
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c (whole disk) unused
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d (user part) MSDOS 1
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e (user part) 4.2BSD 3
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f (user part) MSDOS 4
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.El
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.Pp
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You will notice that the order of the partitions has changed! You will have
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to watchout for this. It is a consequence of NetBSD habit of assigning a
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predefined meaning to the partitions
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.Em a/b
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and
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.Em c .
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.Sh CAVEATS
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The changes made to the AHDI partitions will become active on the next
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.Em first open
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of the device. You are advised to use
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.Nm edahdi
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only on a device without any mounted or otherwise active partitions. This
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is not enforced by
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.Nm edahdi.
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This is particularly confusing when your change caused partitions to shift,
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as shown in the example above.
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.Pp
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As soon as a disk contains at least one NBD partition, you are allowed to
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write disklabels and install bootstraps.
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.Sh "SEE ALSO"
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.Xr disklabel 8
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.Xr installboot 8
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.Sh HISTORY
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The
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.Nm edahdi
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command first appeared in NetBSD 1.1B
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