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https://github.com/samba-team/samba.git
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8a44659c33
Signed-off-by: Karolin Seeger <kseeger@samba.org> Reviewed-by: Ralph Böhme <slow@samba.org>
100 lines
2.8 KiB
XML
100 lines
2.8 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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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">
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<refentry id="vfs_syncops.8">
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<refmeta>
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<refentrytitle>vfs_syncops</refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="source">Samba</refmiscinfo>
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<refmiscinfo class="manual">System Administration tools</refmiscinfo>
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<refmiscinfo class="version">4.6</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>vfs_syncops</refname>
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<refpurpose>Ensure meta data operations are performed synchronously.</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>vfs objects = syncops</command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>DESCRIPTION</title>
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<para>This VFS module is part of the
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<citerefentry><refentrytitle>samba</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry> suite.</para>
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<para>
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Some filesystems (even some journaled filesystems) require that a
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fsync() be performed on many meta data operations to ensure that the
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operation is guaranteed to remain in the filesystem after a power
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failure. This is particularly important for some cluster filesystems
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which are participating in a node failover system with clustered
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Samba. On those filesystems the <command>vfs_syncops</command> VFS module
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provides a way to perform those operations safely.
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</para>
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<para>This module is stackable.</para>
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</refsect1>
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<refsect1>
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<title>CONFIGURATION</title>
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<para>
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Most of the performance loss with the <command>vfs_syncops</command>
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VFS module is in fsync on close(). You can disable that with
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<command>syncops:onclose = no</command> that can be set either globally
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or per share.
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</para>
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<para>
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On certain filesystems that only require the last data written to be
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fsync()'ed, you can disable the metadata synchronization of this module with
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<command>syncops:onmeta = no</command>. This option can be set either
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globally or per share.
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</para>
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<para>
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The <command>vfs_syncops</command> VFS module can also be disabled
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completely for a share with <command>syncops:disable = true</command>.
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</para>
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</refsect1>
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<refsect1>
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<title>EXAMPLES</title>
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<para>Add syncops functionality for [share]:</para>
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<programlisting>
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<smbconfsection name="[share]"/>
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<smbconfoption name="path">/data/share</smbconfoption>
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<smbconfoption name="vfs objects">syncops</smbconfoption>
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<smbconfoption name="syncops:onclose">no</smbconfoption>
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</programlisting>
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</refsect1>
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<refsect1>
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<title>VERSION</title>
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<para>This man page is correct for version 4.1.0 of the Samba suite.
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</para>
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</refsect1>
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<refsect1>
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<title>AUTHOR</title>
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<para>The original Samba software and related utilities
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were created by Andrew Tridgell. Samba is now developed
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by the Samba Team as an Open Source project similar
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to the way the Linux kernel is developed.</para>
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</refsect1>
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</refentry>
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