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authortrasz <trasz@FreeBSD.org>2015-10-18 14:55:09 +0000
committertrasz <trasz@FreeBSD.org>2015-10-18 14:55:09 +0000
commit20350f262a995d1aa9208a2fbba8d68705f7e855 (patch)
tree38a63099823d361c61efcbf577dc775f60747ae3 /sbin
parentd3fb3a1ab26c790031581aa03fda3c00b29cfd4c (diff)
downloadFreeBSD-src-20350f262a995d1aa9208a2fbba8d68705f7e855.zip
FreeBSD-src-20350f262a995d1aa9208a2fbba8d68705f7e855.tar.gz
MFC r286360:
Tweak mdconfig(8) manual page, in particular revise the EXAMPLES section. This removes stuff that doesn't really belong there, and simplifies examples for the basic operations. MFC r286361: Whoops, wrong flag. Sponsored by: The FreeBSD Foundation
Diffstat (limited to 'sbin')
-rw-r--r--sbin/mdconfig/mdconfig.893
1 files changed, 46 insertions, 47 deletions
diff --git a/sbin/mdconfig/mdconfig.8 b/sbin/mdconfig/mdconfig.8
index 1faba2b..8cb9a69 100644
--- a/sbin/mdconfig/mdconfig.8
+++ b/sbin/mdconfig/mdconfig.8
@@ -41,12 +41,12 @@
.\"
.\" $FreeBSD$
.\"
-.Dd November 30, 2013
+.Dd August 6, 2015
.Dt MDCONFIG 8
.Os
.Sh NAME
.Nm mdconfig
-.Nd configure and enable memory disks
+.Nd create and control memory disks
.Sh SYNOPSIS
.Nm
.Fl a
@@ -79,7 +79,7 @@
.Sh DESCRIPTION
The
.Nm
-utility configures and enables
+utility creates and controls
.Xr md 4
devices.
.Pp
@@ -107,7 +107,7 @@ 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.
+panic the system.
.It Cm vnode
A file specified with
.Fl f Ar file
@@ -168,7 +168,9 @@ or
.Cm t
which
denotes byte, kilobyte, megabyte, gigabyte and terabyte respectively.
-The
+When used without the
+.Fl r
+option, the
.Fl a
and
.Fl t Ar swap
@@ -210,6 +212,11 @@ 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.
+This can be used with the
+.Fl d
+flag to forcibly destroy an
+.Xr md 4
+disk that is still in use.
.It Oo Cm no Oc Ns Cm readonly
Enable/disable readonly mode.
.El
@@ -231,66 +238,58 @@ is provided for convenience as an abbreviation of
.Fl t Ar vnode
.Fl f Ar file .
.Sh EXAMPLES
-Create a 4 megabyte
-.Xr malloc 9
-backed memory disk.
-The name of the allocated unit will be printed on stdout, such as
-.Dq Li md3 :
-.Pp
-.Dl mdconfig -a -t malloc -s 4m
-.Pp
-Create a disk named
-.Pa /dev/md4
-with
+Create a disk with
.Pa /tmp/boot.flp
-as backing storage:
+as backing storage.
+The name of the allocated unit will be printed on stdout, such as
+.Dq Li md0 :
+.Bd -literal -offset indent
+mdconfig /tmp/boot.flp
+.Ed
.Pp
-.Dl mdconfig -a -t vnode -f /tmp/boot.flp -u md4
+Create a 1 gigabyte swap backed memory disk named
+.Dq Li md3 :
+.Bd -literal -offset indent
+mdconfig -s 1g -u md3
+.Ed
.Pp
Detach and free all resources used by
-.Pa /dev/md4 :
+.Pa /dev/md3 :
+.Bd -literal -offset indent
+mdconfig -du md3
+.Ed
+.Pp
+Show detailed information on current memory disks:
+.Bd -literal -offset indent
+mdconfig -lv
+.Ed
.Pp
-.Dl mdconfig -d -u md4
+Resize the
+.Dq Li md3
+memory disk to 2 gigabytes:
+.Bd -literal -offset indent
+mdconfig -rs 2g -u md3
+.Ed
.Pp
-Create a 128MByte swap backed disk, initialize an
+Create a 1 gigabyte swap backed disk, initialize an
.Xr ffs 7
file system on it, and mount it on
.Pa /tmp :
.Bd -literal -offset indent
-mdconfig -a -t swap -s 128M -u md10
+mdconfig -s 1g -u md10
newfs -U /dev/md10
mount /dev/md10 /tmp
chmod 1777 /tmp
.Ed
.Pp
-Create a 5MB file-backed disk
-.Po Fl a
-and
-.Fl t Ar vnode
-are implied
-.Pc :
-.Bd -literal -offset indent
-dd if=/dev/zero of=somebackingfile bs=1k count=5k
-mdconfig -f somebackingfile -u md0
-bsdlabel -w md0 auto
-newfs md0c
-mount /dev/md0c /mnt
-.Ed
-.Pp
-Create an
-.Xr md 4
-device out of an ISO 9660 CD image file
-.Po Fl a
-and
-.Fl t Ar vnode
-are implied
-.Pc , using the first available
+Create a memory disk out of an ISO 9660 CD image file,
+using the first available
.Xr md 4
-device, and then mount the new memory disk:
+device, and then mount it:
.Bd -literal -offset indent
mount -t cd9660 /dev/`mdconfig -f cdimage.iso` /mnt
-.Pp
.Ed
+.Pp
Create a file-backed device from a hard disk image that begins
with 512K of raw header information.
.Xr gnop 8
@@ -298,7 +297,7 @@ is used to skip over the header information, positioning
.Pa md1.nop
to the start of the filesystem in the image.
.Bd -literal -offset indent
-mdconfig -f diskimage.img -u md1
+mdconfig -u md1 -f diskimage.img
gnop create -o 512K md1
mount /dev/md1.nop /mnt
.Ed
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