samba-mirror/docs-xml/manpages-3/vfs_shadow_copy2.8.xml

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<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
<refentry id="vfs_shadow_copy2.8">

<refmeta>
	<refentrytitle>vfs_shadow_copy2</refentrytitle>
	<manvolnum>8</manvolnum>
	<refmiscinfo class="source">Samba</refmiscinfo>
	<refmiscinfo class="manual">System Administration tools</refmiscinfo>
	<refmiscinfo class="version">3.5</refmiscinfo>
</refmeta>


<refnamediv>
	<refname>vfs_shadow_copy2</refname>
	<refpurpose>Expose snapshots to Windows clients as shadow copies.</refpurpose>
</refnamediv>

<refsynopsisdiv>
	<cmdsynopsis>
		<command>vfs objects = shadow_copy2</command>
	</cmdsynopsis>
</refsynopsisdiv>

<refsect1>
	<title>DESCRIPTION</title>

	<para>This VFS module is part of the
	<citerefentry><refentrytitle>samba</refentrytitle>
	<manvolnum>7</manvolnum></citerefentry> suite.</para>

	<para>The <command>vfs_shadow_copy2</command> VFS module functionality
	that is similar to Microsoft Shadow Copy services. When setup properly,
	this module allows Microsoft Shadow Copy clients to browse
	"shadow copies" on Samba shares.
	</para>

	<para>This is a 2nd implementation of a shadow copy module. This
	version has the following features:</para>
	<orderedlist continuation="restarts" inheritnum="ignore" numeration="arabic">
        <listitem><para>You don't need to populate your shares with symlinks to the
	snapshots. This can be very important when you have thousands of
	shares, or use [homes].</para></listitem>
	<listitem><para>The inode number of the files is altered so it is different
	from the original. This allows the 'restore' button to work
	without a sharing violation.</para></listitem>
	</orderedlist>

	<para>This module is stackable.</para>

</refsect1>

<refsect1>
	<title>CONFIGURATION</title>

	<para><command>vfs_shadow_copy2</command> relies on a filesystem
	snapshot implementation. Many common filesystems have native
	support for this.
	</para>

	<para>Filesystem snapshots must be mounted on
	specially named directories in order to be recognized by
	<command>vfs_shadow_copy2</command>. The snapshot mount points must
	be immediate children of a the directory being shared.</para>

	<para>The snapshot naming convention is @GMT-YYYY.MM.DD-hh.mm.ss,
	where:
	<itemizedlist>
		<listitem><para><command>YYYY</command> is the 4 digit year</para></listitem>
		<listitem><para><command>MM</command> is the 2 digit month</para></listitem>
		<listitem><para><command>DD</command> is the 2 digit day</para></listitem>
		<listitem><para><command>hh</command> is the 2 digit hour</para></listitem>
		<listitem><para><command>mm</command> is the 2 digit minute</para></listitem>
		<listitem><para><command>ss</command> is the 2 digit second.</para></listitem>
		</itemizedlist>
	</para>

	<para>The <command>vfs_shadow_copy2</command> snapshot naming convention can be
	produced with the following <citerefentry><refentrytitle>date</refentrytitle>
	<manvolnum>1</manvolnum></citerefentry> command:
	<programlisting>
	TZ=GMT date +@GMT-%Y.%m.%d-%H.%M.%S
	</programlisting></para>

</refsect1>

<refsect1>
        <title>OPTIONS</title>

        <variablelist>
		<varlistentry>
                <term>shadow:snapdir = SNAPDIR
                </term>
                <listitem>
                <para>Path to the directory where snapshots are kept.
                </para>
                </listitem>
                </varlistentry>

                <varlistentry>
                <term>shadow:basedir = BASEDIR
		</term>
                <listitem>
                <para>Path to the base directory that snapshots are from.
                </para>
                </listitem>
                </varlistentry>

		<varlistentry>
                <term>shadow:fixinodes = yes/no
                </term>
                <listitem>
                <para>If you enable <command moreinfo="none">shadow:fixinodes
		</command> then this module will modify the apparent inode
		number of files in the snapshot directories using a hash of the
		files path. This is needed for snapshot systems where the
		snapshots have the same device:inode number as the original
		files (such as happens with GPFS snapshots). If you don't set
		this option then the 'restore' button in the shadow copy UI
		will fail with a sharing violation.
                </para>
                </listitem>
                </varlistentry>
		</variablelist>
</refsect1>

<refsect1>
	<title>EXAMPLES</title>

	<para>Add shadow copy support to user home directories:</para>
<programlisting>
        <smbconfsection name="[homes]"/>
	<smbconfoption name="vfs objects">shadow_copy2</smbconfoption>
	<smbconfoption name="shadow:snapdir">/data/snaphots</smbconfoption>
	<smbconfoption name="shadow:basedir">/data/home</smbconfoption>
</programlisting>

</refsect1>

<refsect1>
	<title>CAVEATS</title>

	<para>This is not a backup, archival, or version control solution.
	</para>

	<para>With Samba or Windows servers,
	<command>vfs_shadow_copy2</command> is designed to be an end-user
	tool only. It does not replace or enhance your backup and
	archival solutions and should in no way be considered as
	such. Additionally, if you need version control, implement a
	version control system.</para>

</refsect1>



<refsect1>
	<title>VERSION</title>

	<para>This man page is correct for version 3.2.7 of the Samba suite.
	</para>
</refsect1>

<refsect1>
	<title>AUTHOR</title>

	<para>The original Samba software and related utilities
	were created by Andrew Tridgell. Samba is now developed
	by the Samba Team as an Open Source project similar
	to the way the Linux kernel is developed.</para>

</refsect1>

</refentry>