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+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
+  <!ENTITY % general-entities SYSTEM "../general.ent">
+  %general-entities;
+]>
+
+<sect1 id="ch-config-introduction" revision="sysv">
+  <?dbhtml filename="introduction.html"?>
+
+  <title>Introduction</title>
+
+    <para>Booting a Linux system involves several tasks.  The process must
+    mount both virtual and real file systems, initialize devices, activate swap,
+    check file systems for integrity, mount any swap partitions or files, set
+    the system clock, bring up networking, start any daemons required by the
+    system, and accomplish any other custom tasks needed by the user.  This
+    process must be organized to ensure the tasks are performed in the correct
+    order but, at the same time, be executed as fast as possible.</para>
+
+  <sect2 id='sysv-desc'>
+    <title>System V</title>
+
+    <para>System V is the classic boot process that has been used in Unix and
+    Unix-like systems such as Linux since about 1983.  It consists of a small
+    program, <command>init</command>, that sets up basic programs such as
+    <command>login</command> (via getty) and runs a script.  This script,
+    usually named <command>rc</command>,  controls the execution of a set of
+    additional scripts that perform the tasks required to initialize the
+    system.</para>
+
+    <para>The <command>init</command> program is controlled by the 
+    <filename>/etc/inittab</filename> file and is organized into run levels that
+    can be run by the user:</para>
+
+<literallayout>0 &mdash; halt
+1 &mdash; Single user mode
+2 &mdash; Multiuser, without networking
+3 &mdash; Full multiuser mode
+4 &mdash; User definable
+5 &mdash; Full multiuser mode with display manager
+6 &mdash; reboot</literallayout>
+
+    <para>The usual default run level is 3 or 5.</para>
+
+    <bridgehead renderas="sect3">Advantages</bridgehead>
+
+    <itemizedlist>
+      <listitem>
+          <para>Established, well understood system.</para>
+      </listitem>
+
+      <listitem>
+          <para>Easy to customize.</para>
+      </listitem>
+
+    </itemizedlist>
+
+
+    <bridgehead renderas="sect3">Disadvantages</bridgehead>
+
+    <itemizedlist>
+      <listitem>
+          <para>May be slower to boot.  A medium speed base LFS system 
+          takes 8-12 seconds where the boot time is measured from the 
+          first kernel message to the login prompt.  Network 
+          connectivity is typically established about 2 seconds 
+          after the login prompt.</para>
+      </listitem>
+
+      <listitem>
+          <para>Serial processing of boot tasks. This is related to the previous
+          point.  A delay in any process such as a file system check, will
+          delay the entire boot process.</para>
+      </listitem>
+
+      <listitem>
+          <para>Does not directly support advanced features like
+          control groups (cgroups), and per-user fair share scheduling.</para>
+      </listitem>
+
+      <listitem>
+          <para>Adding scripts requires manual, static sequencing decisions.</para>
+      </listitem>
+
+    </itemizedlist>
+
+  </sect2>
+
+</sect1>
+