HardenedBSD/sbin/mdconfig/mdconfig.8

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.\" Copyright (c) 2000
.\"	Poul-Henning Kamp  All rights reserved.
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.\"     @(#)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 December 31, 2000
.Dt MDCONFIG 8
.Os FreeBSD 5
.Sh NAME
.Nm mdconfig
.Nd configure and enable memory disks
.Sh SYNOPSIS
.Nm
.Fl a
.Fl t Ar type 
.Op Fl o Ar [no]option
.Op Fl s Ar size
.Op Fl f Ar file
.Op Fl u Ar unit
.Nm
.Fl d
.Fl u Ar unit
.Sh DESCRIPTION
The
.Nm
command 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
Dettach a memory disk from the system and release all resources.
.It Fl t
Select the type of the memory disk.
.Bl -tag -width indent
.It Ar 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.
.It Ar preload
This type represents memory disks which were instantiated by objects loaded
by the bootloader.  They can not be created on the fly.
.It Ar vnode
A file specified with 
.Fl f Ar file
becomes the backingstore for this memory disk.
.It Ar swap
swapspace is used to back this memory disk.
.El
.It Fl f Ar file
Filename to use for the vnode type memory disk.
.It Fl s Ar size
Size of the memory disk.
.Ar Size
is the number of 512 bytes sectors unless suffixed with a 'k', 'm', or 'g' which
denotes kilobyte, megabyte and gigabyte respectively.
.It Fl o Ar [no]option
Set or reset options.
.Bl -tag -width indent
.It Ar [no]reserve
Allocate and reserve all needed storage from the start, rather than as needed.
.It Ar [no]cluster
Enable clustering on this disk.
.It Ar [no]autounit
Automatically allocate the next free unit number for this disk.
The basename of the disk is printed on stdout.
.It Ar [no]compress
Enable/Disable compression features to reduce memory usage.
.El
.El
.Sh EXAMPLES
.Pp
To create a 4 megabyte malloc(9) backed memory disk.
The name of the allocated unit will be output on stdout like ``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 dettach and free all resources used by
.Pa /dev/md4 :
.Pp
.Dl mdconfig -d -u 4
.Pp
To create and mount a 128MByte swap backed filesystem on
.Pa /tmp :
.Pp
.Dl mdconfig -a -t swap -s 128M -u 10
.Dl disklabel -r -w md10 auto
.Dl newfs -f 4096 /dev/md10c
.Dl tunefs -n enable /dev/md10c
.Dl mount /dev/md10c /tmp
.Sh SEE ALSO
.Xr md 4 ,
.Xr disklabel 8 ,
.Xr fdisk 8 ,
.Xr malloc 9 .