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Initial take at documenting vnconfig and the new md.

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Neil Blakey-Milner 2000-03-25 14:12:56 +00:00
parent d8f4f9e2f2
commit a64ff19866
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=6859
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82
en_US.ISO8859-1/books/handbook/disks/chapter.sgml
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@ -1,7 +1,7 @@
<!--
The FreeBSD Documentation Project
$FreeBSD: doc/en_US.ISO_8859-1/books/handbook/disks/chapter.sgml,v 1.12 2000/03/20 20:59:42 jim Exp $
$FreeBSD: doc/en_US.ISO_8859-1/books/handbook/disks/chapter.sgml,v 1.13 2000/03/20 22:21:32 jim Exp $
-->
<chapter id="disks">
@ -223,6 +223,86 @@
</sect3>
</sect2>
</sect1>
<sect1 id="disks-virtual">
<title>Virtual disks: Network, memory, and file-based filesystems</title>
<para>Besides the disks you physically insert into your computer;
floppies, CDs, hard drives, and so forth, other forms of disks
are understood by FreeBSD - the <firstterm>virtual
disks</firstterm>.</para>
<para>These include network filesystems such as the <link
linkend="nfs">Network Filesystem</link> and Coda, memory-based
filesystems such as <link linkend="disks-md">md</link> and
file-backed filesystems created by <link
linkend="disks-vnconfig">vnconfig</link>.</para>
<sect2 id="disks-vnconfig">
<title>vnconfig: file-backed filesystem</title>
<para>&man.vnconfig.8; configures and enables vnode pseudo disk
devices. A <firstterm>vnode</firstterm> is a representation
of a file, and is the focus of file activity. This means that
&man.vnconfig.8; uses files to create and operate a
filesystem. One possible use is the mounting of floppy or CD
images kept in files.</para>
<para>To mount an existing filesystem image:</para>
<example>
<title>Using vnconfig to mount an existing filesystem
image</title>
<screen>&prompt.root; <userinput>vnconfig vn<replaceable>0</replaceable> <replaceable>diskimage</replaceable></userinput>
<userinput>&prompt.root; mount /dev/vn<replaceable>0</replaceable>c <replaceable>/mnt</replaceable></userinput></screen>
</example>
<para>To create a new filesystem image with vnconfig:</para>
<example>
<title>Creating a new file-backed disk with vnconfig</title>
<screen>&prompt.root; <userinput>dd if=/dev/zero of=<replaceable>newimage</replaceable> bs=1k count=<replaceable>5</replaceable>k</userinput>
5120+0 records in
5120+0 records out
&prompt.root; <userinput>vnconfig -s labels -c vn<replaceable>0</replaceable> <replaceable>newimage</replaceable></userinput>
&prompt.root; <userinput>disklabel -r -w vn<replaceable>0</replaceable></userinput>
&prompt.root; <userinput>newfs vn<replaceable>0</replaceable>c</userinput>
Warning: 2048 sector(s) in last cylinder unallocated
/dev/rvn0c: 10240 sectors in 3 cylinders of 1 tracks, 4096 sectors
5.0MB in 1 cyl groups (16 c/g, 32.00MB/g, 1280 i/g)
super-block backups (for fsck -b #) at:
32
&prompt.root; <userinput>mount /dev/vn<replaceable>0</replaceable>c <replaceable>/mnt</replaceable></userinput>
&prompt.root; <userinput>df <replaceable>/mnt</replaceable></userinput>
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/vn0c 4927 1 4532 0% /mnt</screen>
</example>
</sect2>
<sect2 id="disks-md">
<title>md: memory filesystem</title>
<para>md is a simple, efficient means to do memory
filesystems.</para>
<para>Simply take a filesystem you've prepared with, for
example, &man.vnconfig.8;, and:</para>
<example>
<title>md memory disk</title>
<screen>&prompt.root; <userinput>dd if=<replaceable>newimage</replaceable> of=/dev/md<replaceable>0</replaceable></userinput>
5120+0 records in
5120+0 records out
&prompt.root; <userinput>mount /dev/md<replaceable>0c</replaceable> <replaceable>/mnt</replaceable></userinput>
&prompt.root; <userinput>df <replaceable>/mnt</replaceable></userinput>
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/md0c 4927 1 4532 0% /mnt</screen>
</example>
</sect2>
</sect1>
<sect1 id="quotas">
<title>Disk Quotas</title>

82
en_US.ISO_8859-1/books/handbook/disks/chapter.sgml
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<!--
The FreeBSD Documentation Project
$FreeBSD: doc/en_US.ISO_8859-1/books/handbook/disks/chapter.sgml,v 1.12 2000/03/20 20:59:42 jim Exp $
$FreeBSD: doc/en_US.ISO_8859-1/books/handbook/disks/chapter.sgml,v 1.13 2000/03/20 22:21:32 jim Exp $
-->
<chapter id="disks">
@ -223,6 +223,86 @@
</sect3>
</sect2>
</sect1>
<sect1 id="disks-virtual">
<title>Virtual disks: Network, memory, and file-based filesystems</title>
<para>Besides the disks you physically insert into your computer;
floppies, CDs, hard drives, and so forth, other forms of disks
are understood by FreeBSD - the <firstterm>virtual
disks</firstterm>.</para>
<para>These include network filesystems such as the <link
linkend="nfs">Network Filesystem</link> and Coda, memory-based
filesystems such as <link linkend="disks-md">md</link> and
file-backed filesystems created by <link
linkend="disks-vnconfig">vnconfig</link>.</para>
<sect2 id="disks-vnconfig">
<title>vnconfig: file-backed filesystem</title>
<para>&man.vnconfig.8; configures and enables vnode pseudo disk
devices. A <firstterm>vnode</firstterm> is a representation
of a file, and is the focus of file activity. This means that
&man.vnconfig.8; uses files to create and operate a
filesystem. One possible use is the mounting of floppy or CD
images kept in files.</para>
<para>To mount an existing filesystem image:</para>
<example>
<title>Using vnconfig to mount an existing filesystem
image</title>
<screen>&prompt.root; <userinput>vnconfig vn<replaceable>0</replaceable> <replaceable>diskimage</replaceable></userinput>
<userinput>&prompt.root; mount /dev/vn<replaceable>0</replaceable>c <replaceable>/mnt</replaceable></userinput></screen>
</example>
<para>To create a new filesystem image with vnconfig:</para>
<example>
<title>Creating a new file-backed disk with vnconfig</title>
<screen>&prompt.root; <userinput>dd if=/dev/zero of=<replaceable>newimage</replaceable> bs=1k count=<replaceable>5</replaceable>k</userinput>
5120+0 records in
5120+0 records out
&prompt.root; <userinput>vnconfig -s labels -c vn<replaceable>0</replaceable> <replaceable>newimage</replaceable></userinput>
&prompt.root; <userinput>disklabel -r -w vn<replaceable>0</replaceable></userinput>
&prompt.root; <userinput>newfs vn<replaceable>0</replaceable>c</userinput>
Warning: 2048 sector(s) in last cylinder unallocated
/dev/rvn0c: 10240 sectors in 3 cylinders of 1 tracks, 4096 sectors
5.0MB in 1 cyl groups (16 c/g, 32.00MB/g, 1280 i/g)
super-block backups (for fsck -b #) at:
32
&prompt.root; <userinput>mount /dev/vn<replaceable>0</replaceable>c <replaceable>/mnt</replaceable></userinput>
&prompt.root; <userinput>df <replaceable>/mnt</replaceable></userinput>
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/vn0c 4927 1 4532 0% /mnt</screen>
</example>
</sect2>
<sect2 id="disks-md">
<title>md: memory filesystem</title>
<para>md is a simple, efficient means to do memory
filesystems.</para>
<para>Simply take a filesystem you've prepared with, for
example, &man.vnconfig.8;, and:</para>
<example>
<title>md memory disk</title>
<screen>&prompt.root; <userinput>dd if=<replaceable>newimage</replaceable> of=/dev/md<replaceable>0</replaceable></userinput>
5120+0 records in
5120+0 records out
&prompt.root; <userinput>mount /dev/md<replaceable>0c</replaceable> <replaceable>/mnt</replaceable></userinput>
&prompt.root; <userinput>df <replaceable>/mnt</replaceable></userinput>
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/md0c 4927 1 4532 0% /mnt</screen>
</example>
</sect2>
</sect1>
<sect1 id="quotas">
<title>Disk Quotas</title>