e10469fef8
entirely as previously advertised. md(4) adopted all assets of vn(4) some time back and has proper devfs support and cloning abilities to boot.
193 lines
5.1 KiB
Groff
193 lines
5.1 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
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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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.Oo
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.Fl o
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.Oo Cm no Oc Ns Ar option
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.Oc
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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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.Nm
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.Fl l
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.Op 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.
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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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Detach a memory disk from the system and release all resources.
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.It Fl t Ar type
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Select the type of the memory disk.
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.Bl -tag -width "preload"
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.It Cm 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 Cm 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 Cm 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 l
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List information about configured
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.Xr md 4
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devices. If the
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.Fl u
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option is used in conjuction with this, the output is limited to
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information on the specified device.
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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
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.Cm k , m ,
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or
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.Cm g
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which
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denotes kilobyte, megabyte and gigabyte respectively.
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.It Xo
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.Fl o Oo Cm no Oc Ns Ar option
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.Xc
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Set or reset options.
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.Bl -tag -width indent
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.It Xo
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.Oo Cm no Oc Ns Cm reserve
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.Xc
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Allocate and reserve all needed storage from the start, rather than as needed.
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.It Xo
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.Oo Cm no Oc Ns Cm cluster
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.Xc
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Enable clustering on this disk.
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.It Xo
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.Oo Cm no Oc Ns Cm compress
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.Xc
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Enable/Disable compression features to reduce memory usage.
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.It Xo
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.Oo Cm no Oc Ns Cm readonly
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.Xc
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Enable/Disable readonly mode.
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.El
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.It Fl u Ar unit
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Request a specific unit number for the
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.Xr md 4
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device instead of automatic allocation.
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.El
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.Sh EXAMPLES
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To create a 4 megabyte
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.Xr malloc 9
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backed memory disk.
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The name of the allocated unit will be output on stdout like
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.Dq Li 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 detach 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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.Bd -literal -offset indent
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mdconfig -a -t swap -s 128M -u 10
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disklabel -r -w md10 auto
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newfs /dev/md10c
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tunefs -n enable /dev/md10c
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mount /dev/md10c /tmp
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chmod 1777 /tmp
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.Ed
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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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.Sh HISTORY
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The
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.Nm
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first appeared in
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.Fx 5.0
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as a cleaner replacement for the
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.Xr vn 4
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and
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.Xr vnconfig 8
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combo.
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.Sh AUTHORS
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The
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.Nm
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program was written by Poul-Henning Kamp
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.Aq phk@FreeBSD.org .
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