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<?xml version="1.0" encoding="iso-8859-1"?>
<!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_commit.8">
<refmeta>
<refentrytitle>vfs_commit</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="source">Samba</refmiscinfo>
<refmiscinfo class="manual">System Administration tools</refmiscinfo>
<refmiscinfo class="version">3.2</refmiscinfo>
</refmeta>
<refnamediv>
<refname>vfs_commit</refname>
<refpurpose>flush dirty data at specified intervals</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>vfs objects = commit</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_commit</command> VFS module keeps track of
the amount of data written to a file and synchronizes it to
disk when a specified amount accumulates.
</para>
<para><command>vfs_commit</command> is useful in two
circumstances. First, if you have very precious data, the
impact of unexpected power loss can be minimized by a small
commit:dthresh value. Secondly, write performance can be
improved on some systems by flushing file data early and at
regular intervals.</para>
<para>This module is stackable.</para>
</refsect1>
<refsect1>
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term>commit:dthresh = BYTES</term>
<listitem>
<para>Synchronize file data each time the specified
number of bytes has been written.
</para>
<para>The following suffixes may be applied to BYTES:</para>
<itemizedlist>
<listitem><para><command>K</command> - BYTES is a number of kilobytes</para></listitem>
<listitem><para><command>M</command> - BYTES is a number of megabytes</para></listitem>
<listitem><para><command>G</command> - BYTES is a number of gigabytes</para></listitem>
</itemizedlist>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>EXAMPLES</title>
<para>Synchronize the file data on the [precious] share after
every 512 kilobytes (524288 bytes) of data is written:</para>
<programlisting>
<smbconfsection name="[precious]"/>
<smbconfoption name="path">/data/precious</smbconfoption>
<smbconfoption name="vfs objects">commit</smbconfoption>
<smbconfoption name="commit:dthresh">512K</smbconfoption>
</programlisting>
</refsect1>
<refsect1>
<title>CAVEATS</title>
<para>On some systems, the data synchronization performed by
<command>commit</command> may reduce performance.
</para>
</refsect1>
<refsect1>
<title>VERSION</title>
<para>This man page is correct for version 3.0.25 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>
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