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