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-<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>
-
- <pubdate>12 Jul 2000</pubdate>
-</chapterinfo>
-
-
-<title>Hosting a Microsoft Distributed File System tree on Samba</title>
-
-<sect1>
-
- <title>Instructions</title>
-
- <para>The Distributed File System (or 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 etc. For more information about Dfs, refer to <ulink
- url="http://www.microsoft.com/NTServer/nts/downloads/winfeatures/NTSDistrFile/AdminGuide.asp">
- Microsoft documentation</ulink>. </para>
-
- <para>This document explains how to host a Dfs tree on a Unix
- machine (for Dfs-aware clients to browse) using Samba.</para>
-
- <para>To enable SMB-based DFS for Samba, configure it with the
- <parameter>--with-msdfs</parameter> option. Once built, a
- Samba server can be made a Dfs server by setting the global
- boolean <ulink url="smb.conf.5.html#HOSTMSDFS"><parameter>
- host msdfs</parameter></ulink> parameter in the <filename>smb.conf
- </filename> file. You designate a share as a Dfs root using the share
- level boolean <ulink url="smb.conf.5.html#MSDFSROOT"><parameter>
- msdfs root</parameter></ulink> 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, \\storage1\share1).</para>
-
- <para>Dfs trees on Samba work with all Dfs-aware clients ranging
- from Windows 95 to 2000.</para>
-
- <para>Here's an example of setting up a Dfs tree on a Samba
- server.</para>
-
- <para><programlisting>
-# The smb.conf file:
-[global]
- netbios name = SAMBA
- host msdfs = yes
-
-[dfs]
- path = /export/dfsroot
- msdfs root = yes
- </programlisting></para>
-
-
- <para>In the /export/dfsroot directory we set up our dfs links to
- other servers on the network.</para>
-
- <para><prompt>root# </prompt><userinput>cd /export/dfsroot</userinput></para>
- <para><prompt>root# </prompt><userinput>chown root /export/dfsroot</userinput></para>
- <para><prompt>root# </prompt><userinput>chmod 755 /export/dfsroot</userinput></para>
- <para><prompt>root# </prompt><userinput>ln -s msdfs:storageA\\shareA linka</userinput></para>
- <para><prompt>root# </prompt><userinput>ln -s msdfs:serverB\\share,serverC\\share linkb</userinput></para>
-
-
- <para>You should set up the permissions and ownership of
- the directory acting as the Dfs root such 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>
-
- <sect2>
- <title>Notes</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 that only designated users can
- modify the symbolic links in the directory.</para>
- </listitem>
- </itemizedlist>
- </sect2>
-</sect1>
-
-
-
-</chapter>