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+<?xml version="1.0" encoding="iso-8859-1"?>
+<!DOCTYPE chapter PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
+<chapter id="msdfs">
+
+<chapterinfo>
+	<author>
+		<firstname>Shirish</firstname><surname>Kalele</surname>
+		<affiliation>
+			<orgname>Samba Team &amp; Veritas Software</orgname>
+			<address>
+				<email>samba@samba.org</email>
+			</address>
+		</affiliation>
+	</author>
+	&author.jht;
+	
+	<pubdate>12 Jul 2000</pubdate>
+</chapterinfo>
+
+<title>Hosting a Microsoft Distributed File System Tree</title>
+
+<sect1>
+<title>Features and Benefits</title>
+
+	<para>
+	The Distributed File System (DFS) provides a means of separating the logical
+	view of files and directories that users see from the actual physical locations
+	of these resources on the network. It allows for higher availability, smoother
+	storage expansion, load balancing, and so on.
+	</para>
+
+	<para>
+	For information about DFS, refer to the 
+<ulink url="http://www.microsoft.com/NTServer/nts/downloads/winfeatures/NTSDistrFile/AdminGuide.asp">Microsoft documentation</ulink>.
+	This document explains how to host a DFS tree on a UNIX machine (for DFS-aware
+	clients to browse) using Samba.
+	</para>
+
+	<para>
+	A Samba server can be made a DFS server by setting the global 
+	Boolean <smbconfoption name="host msdfs"/>
+	parameter in the &smb.conf; file. You designate a share as a DFS
+	root using the Share Level Boolean <smbconfoption name="msdfs root"/> parameter. A DFS root directory on Samba hosts DFS
+	links in the form of symbolic links that point to other servers. For example, a symbolic link
+	<filename>junction-&gt;msdfs:storage1\share1</filename> in the share directory acts
+	as the DFS junction. When DFS-aware clients attempt to access the junction link,
+	they are redirected to the storage location (in this case, <parameter>\\storage1\share1</parameter>).
+	</para>
+
+	<para>
+	DFS trees on Samba work with all DFS-aware clients ranging from Windows 95 to 200x.
+	<link linkend="dfscfg">Following sample configuration</link> shows how to setup a DFS tree on a Samba server.
+	In the <filename>/export/dfsroot</filename> directory, you set up your DFS links to 
+	other servers on the network.
+<screen>
+&rootprompt;<userinput>cd /export/dfsroot</userinput>
+&rootprompt;<userinput>chown root /export/dfsroot</userinput>
+&rootprompt;<userinput>chmod 755 /export/dfsroot</userinput>
+&rootprompt;<userinput>ln -s msdfs:storageA\\shareA linka</userinput>
+&rootprompt;<userinput>ln -s msdfs:serverB\\share,serverC\\share linkb</userinput>
+</screen>
+</para>
+
+<para>
+<smbconfexample id="dfscfg">
+<title>smb.conf with DFS configured</title>
+<smbconfsection name="[global]"/>
+<smbconfoption name="netbios name">&example.server.samba;</smbconfoption>
+<smbconfoption name="host msdfs  ">yes</smbconfoption>
+
+<smbconfsection name="[dfs]"/>
+<smbconfoption name="path">/export/dfsroot</smbconfoption>
+<smbconfoption name="msdfs root">yes</smbconfoption>
+</smbconfexample>
+</para>
+
+	<para>You should set up the permissions and ownership of 
+	the directory acting as the DFS root so that only designated 
+	users can create, delete or modify the msdfs links. Also note 
+	that symlink names should be all lowercase. This limitation exists 
+	to have Samba avoid trying all the case combinations to get at 
+	the link name. Finally, set up the symbolic links to point to the 
+	network shares you want and start Samba.</para>
+
+	<para>Users on DFS-aware clients can now browse the DFS tree 
+	on the Samba server at \\samba\dfs. Accessing 
+	links linka or linkb (which appear as directories to the client) 
+	takes users directly to the appropriate shares on the network.</para>
+</sect1>
+
+<sect1>
+<title>Common Errors</title>
+	<itemizedlist>
+		<listitem><para>Windows clients need to be rebooted 
+		if a previously mounted non-DFS share is made a DFS 
+		root or vice versa. A better way is to introduce a 
+		new share and make it the DFS root.</para>
+		</listitem>
+		
+		<listitem><para>Currently, there's a restriction that msdfs 
+		symlink names should all be lowercase.</para>
+		</listitem>
+		
+		<listitem><para>For security purposes, the directory 
+		acting as the root of the DFS tree should have ownership 
+		and permissions set so only designated users can 
+		modify the symbolic links in the directory.</para>
+		</listitem>
+	</itemizedlist>
+
+	<sect2>
+		<title>MSDFS UNIX Path Is Case-Critical</title>
+
+		<para>
+		A network administrator sent advice to the Samba mailing list
+		after a long sessions trying to determine why DFS was not working.
+		His advice is worth noting.
+		</para>
+
+		<para><quote>
+		I spent some time trying to figure out why my particular
+		dfs root wasn't working. I noted in the documentation that
+		the symlink should be in all lowercase. It should be
+		amended that the entire path to the symlink should all be
+		in lowercase as well.
+		</quote></para>
+
+		<para>
+		For example, I had a share defined as such:
+
+		<screen>
+		[pub]
+			path = /export/home/Shares/public_share
+			msdfs root = yes
+		</screen>
+
+		and I could not make my Windows 9x/Me (with the dfs client installed)
+		follow this symlink:
+
+		<screen>
+			damage1 -> msdfs:damage\test-share
+		</screen>
+		</para>
+
+		<para>
+		Running a debug level of 10 reveals:
+
+		<programlisting>
+		[2003/08/20 11:40:33, 5] msdfs/msdfs.c:is_msdfs_link(176)
+		  is_msdfs_link: /export/home/shares/public_share/* does not exist.
+		</programlisting>
+
+		Curious. So I changed the directory name from .../Shares/... to
+		.../shares/... (along with my service definition) and it worked!
+		</para>
+
+	</sect2>
+
+</sect1>
+
+</chapter>