Index: releng/6.3/sbin/mdconfig/mdconfig.8
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+.\" Copyright (c) 1993 University of Utah.
+.\" Copyright (c) 1980, 1989, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\" Copyright (c) 2000
+.\"	Poul-Henning Kamp  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the Systems Programming Group of the University of Utah Computer
+.\" Science Department.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)vnconfig.8	8.1 (Berkeley) 6/5/93
+.\" from: src/usr.sbin/vnconfig/vnconfig.8,v 1.19 2000/12/27 15:30:29
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 18, 2007
+.Dt MDCONFIG 8
+.Os
+.Sh NAME
+.Nm mdconfig
+.Nd configure and enable memory disks
+.Sh SYNOPSIS
+.Nm
+.Fl a
+.Fl t Ar type
+.Op Fl n
+.Oo Fl o Oo Cm no Oc Ns Ar option Oc ...
+.Op Fl f Ar file
+.Op Fl s Ar size
+.Op Fl S Ar sectorsize
+.Op Fl u Ar unit
+.Op Fl x Ar sectors/track
+.Op Fl y Ar heads/cyl
+.Nm
+.Fl d
+.Fl u Ar unit
+.Nm
+.Fl l
+.Op Fl n
+.Op Fl u Ar unit
+.Sh DESCRIPTION
+The
+.Nm
+utility configures and enables
+.Xr md 4
+devices.
+.Pp
+Options indicate an action to be performed:
+.Bl -tag -width indent
+.It Fl a
+Attach a memory disk.
+This will configure and attach a memory disk with the
+parameters specified and attach it to the system.
+.It Fl d
+Detach a memory disk from the system and release all resources.
+.It Fl t Ar type
+Select the type of the memory disk.
+.Bl -tag -width "preload"
+.It Cm malloc
+Storage for this type of memory disk is allocated with
+.Xr malloc 9 .
+This limits the size to the malloc bucket limit in the kernel.
+If the
+.Fl o Cm reserve
+option is not set, creating and filling a large
+malloc-backed memory disk is a very easy way to
+panic a system.
+.It Cm vnode
+A file specified with
+.Fl f Ar file
+becomes the backingstore for this memory disk.
+.It Cm swap
+Swap space is used to back this memory disk.
+.El
+.It Fl f Ar file
+Filename to use for the vnode type memory disk. Options
+.Fl a
+and
+.Fl t Ar vnode
+are implied if not specified.
+.It Fl l
+List configured devices.
+If given with
+.Fl u ,
+display details about that particular device.
+.It Fl n
+When printing md device names, print only the unit number without the
+md prefix.
+.It Fl s Ar size
+Size of the memory disk.
+.Ar Size
+is the number of 512 byte sectors unless suffixed with a
+.Cm b , k , m , g ,
+or
+.Cm t
+which
+denotes byte, kilobyte, megabyte, gigabyte and terabyte respectively. Options
+.Fl a
+and
+.Fl t Ar swap
+are implied if not specified.
+.It Fl S Ar sectorsize
+Sectorsize to use for malloc backed device.
+.It Fl x Ar sectors/track
+See the description of the
+.Fl y
+option below.
+.It Fl y Ar heads/cylinder
+For
+.Cm malloc
+or
+.Cm vnode
+backed devices, the
+.Fl x
+and
+.Fl y
+options can be used to specify a synthetic geometry.
+This is useful for constructing bootable images for later download to
+other devices.
+.It Fl o Oo Cm no Oc Ns Ar option
+Set or reset options.
+.Bl -tag -width indent
+.It Oo Cm no Oc Ns Cm async
+For
+.Cm vnode
+backed devices: avoid
+.Dv IO_SYNC
+for increased performance but
+at the risk of deadlocking the entire kernel.
+.It Oo Cm no Oc Ns Cm reserve
+Allocate and reserve all needed storage from the start, rather than as needed.
+.It Oo Cm no Oc Ns Cm cluster
+Enable clustering on this disk.
+.It Oo Cm no Oc Ns Cm compress
+Enable/Disable compression features to reduce memory usage.
+.It Oo Cm no Oc Ns Cm force
+Disable/Enable extra sanity checks to prevent the user from doing something
+that might adversely affect the system.
+.It Oo Cm no Oc Ns Cm readonly
+Enable/Disable readonly mode.
+.El
+.It Fl u Ar unit
+Request a specific unit number for the
+.Xr md 4
+device instead of automatic allocation.
+.El
+.Sh EXAMPLES
+To create a 4 megabyte
+.Xr malloc 9
+backed memory disk.
+The name of the allocated unit will be output on stdout like
+.Dq Li md3 :
+.Pp
+.Dl mdconfig -a -t malloc -s 4m
+.Pp
+To create a disk named
+.Pa /dev/md4
+with
+.Pa /tmp/boot.flp
+as backing:
+.Pp
+.Dl mdconfig -a -t vnode -f /tmp/boot.flp -u 4
+.Pp
+To detach and free all resources used by
+.Pa /dev/md4 :
+.Pp
+.Dl mdconfig -d -u 4
+.Pp
+To create and mount a 128MByte swap backed file system on
+.Pa /tmp :
+.Bd -literal -offset indent
+mdconfig -a -t swap -s 128M -u 10
+newfs -U /dev/md10
+mount /dev/md10 /tmp
+chmod 1777 /tmp
+.Ed
+.Pp
+To create a 5MB file-backed disk (
+.Fl -a
+and
+.Fl -t Ar vnode
+are implied):
+.Bd -literal -offset indent
+dd if=/dev/zero of=somebackingfile bs=1k count=5k
+mdconfig -f somebackingfile -u 0
+bsdlabel -w md0 auto
+newfs md0c
+mount /dev/md0c /mnt
+.Ed
+.Pp
+To mount an ISO 9660 CD image file:
+.Bd -literal -offset indent
+mdconfig -a -t vnode -u 10 -f cdimage.iso
+mount_cd9660 /dev/md10 /mnt
+.Ed
+.Sh SEE ALSO
+.Xr md 4 ,
+.Xr bsdlabel 8 ,
+.Xr fdisk 8 ,
+.Xr mdmfs 8 ,
+.Xr malloc 9
+.Sh HISTORY
+The
+.Nm
+utility first appeared in
+.Fx 5.0
+as a cleaner replacement for the
+.Xr vn 4
+and
+.Xr vnconfig 8
+combo.
+.Sh AUTHORS
+The
+.Nm
+utility was written by
+.An Poul-Henning Kamp
+.Aq phk@FreeBSD.org .

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