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c2ef0b73df
Add a rudimentary man-page. (I'm no mdoc wizard, feel free to attack my mistakes and blunders)
146 lines
4.7 KiB
Groff
146 lines
4.7 KiB
Groff
.\" Copyright (c) 1993 University of Utah.
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.\" Copyright (c) 1980, 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\" Copyright (c) 2000
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.\" Poul-Henning Kamp All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Systems Programming Group of the University of Utah Computer
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.\" Science Department.
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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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.\" @(#)vnconfig.8 8.1 (Berkeley) 6/5/93
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.\" from: src/usr.sbin/vnconfig/vnconfig.8,v 1.19 2000/12/27 15:30:29
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 31, 2000
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.Dt MDCONFIG 8
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.Os FreeBSD 5
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.Sh NAME
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.Nm mdconfig
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.Nd configure and enable memory disks
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.Sh SYNOPSIS
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.Nm
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.Fl a
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.Fl t Ar type
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.Op Fl o Ar [no]option
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.Op Fl s Ar size
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.Op Fl f Ar file
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.Op Fl u Ar unit
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.Nm
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.Fl d
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.Fl u Ar unit
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.Sh DESCRIPTION
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The
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.Nm
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command configures and enables
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.Xr md(4)
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devices.
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.Pp
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Options indicate an action to be performed:
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.Bl -tag -width indent
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.It Fl a
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Attach a memory disk. This will configure and attach a memory disk with the
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parameters specified and attach it to the system.
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.It Fl d
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Dettach a memory disk from the system and release all resources.
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.It Fl t
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Select the type of the memory disk.
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.Bl -tag -width indent
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.It Ar malloc
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Storage for this type of memory disk is allocated with
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.Xr malloc 9 .
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This limits the size to the malloc bucket limit in the kernel.
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.It Ar preload
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This type represents memory disks which were instantiated by objects loaded
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by the bootloader. They can not be created on the fly.
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.It Ar vnode
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A file specified with
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.Fl f Ar file
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becomes the backingstore for this memory disk.
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.It Ar swap
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swapspace is used to back this memory disk.
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.El
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.It Fl f Ar file
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Filename to use for the vnode type memory disk.
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.It Fl s Ar size
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Size of the memory disk.
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.Ar Size
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is the number of 512 bytes sectors unless suffixed with a 'k', 'm', or 'g' which
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denotes kilobyte, megabyte and gigabyte respectively.
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.It Fl o Ar [no]option
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Set or reset options.
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.Bl -tag -width indent
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.It Ar [no]reserve
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Allocate and reserve all needed storage from the start, rather than as needed.
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.It Ar [no]cluster
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Enable clustering on this disk.
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.It Ar [no]autounit
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Automatically allocate the next free unit number for this disk.
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The basename of the disk is printed on stdout.
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.It Ar [no]compress
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Enable/Disable compression features to reduce memory usage.
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.El
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.El
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.Sh EXAMPLES
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.Pp
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To create a 4 megabyte malloc(9) backed memory disk.
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The name of the allocated unit will be output on stdout like ``md3'':
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.Pp
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.Dl mdconfig -a -t malloc -s 4m
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.Pp
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To create a disk named
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.Pa /dev/md4
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with
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.Pa /tmp/boot.flp
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as backing:
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.Pp
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.Dl mdconfig -a -t vnode -f /tmp/boot.flp -u 4
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.Pp
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To dettach and free all resources used by
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.Pa /dev/md4 :
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.Pp
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.Dl mdconfig -d -u 4
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.Pp
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To create and mount a 128MByte swap backed filesystem on
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.Pa /tmp :
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.Pp
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.Dl mdconfig -a -t swap -s 128M -u 10
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.Dl disklabel -r -w md10 auto
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.Dl newfs -f 4096 /dev/md10c
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.Dl tunefs -n enable /dev/md10c
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.Dl mount /dev/md10c /tmp
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.Sh SEE ALSO
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.Xr md 4 ,
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.Xr disklabel 8 ,
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.Xr fdisk 8 ,
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.Xr malloc 9 .
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