| 1 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>vfs_commit</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.74.0"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en"><a name="vfs_commit.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>vfs_commit — flush dirty data at specified intervals</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="literal">vfs objects = commit</code></p></div></div><div class="refsect1" lang="en"><a name="id2522928"></a><h2>DESCRIPTION</h2><p>This VFS module is part of the
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| 2 | <a class="citerefentry" href="samba.7.html"><span class="citerefentry"><span class="refentrytitle">samba</span>(7)</span></a> suite.</p><p>The <code class="literal">vfs_commit</code> VFS module keeps track of
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| 3 | the amount of data written to a file and synchronizes it to
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| 4 | disk when a specified amount accumulates.
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| 5 | </p><p><code class="literal">vfs_commit</code> is useful in two
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| 6 | circumstances. First, if you have very precious data, the
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| 7 | impact of unexpected power loss can be minimized by a small
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| 8 | commit:dthresh value. Secondly, write performance can be
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| 9 | improved on some systems by flushing file data early and at
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| 10 | regular intervals.</p><p>This module is stackable.</p></div><div class="refsect1" lang="en"><a name="id2483346"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">commit:dthresh = BYTES</span></dt><dd><p>Synchronize file data each time the specified
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| 11 | number of bytes has been written.
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| 12 | </p><p>The following suffixes may be applied to BYTES:</p><div class="itemizedlist"><ul type="disc"><li><p><code class="literal">K</code> - BYTES is a number of kilobytes</p></li><li><p><code class="literal">M</code> - BYTES is a number of megabytes</p></li><li><p><code class="literal">G</code> - BYTES is a number of gigabytes</p></li></ul></div></dd></dl></div></div><div class="refsect1" lang="en"><a name="id2483405"></a><h2>EXAMPLES</h2><p>Synchronize the file data on the [precious] share after
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| 13 | every 512 kilobytes (524288 bytes) of data is written:</p><pre class="programlisting">
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| 14 | <em class="parameter"><code>[precious]</code></em>
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| 15 | <a class="link" href="smb.conf.5.html#PATH" target="_top">path = /data/precious</a>
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| 16 | <a class="link" href="smb.conf.5.html#VFSOBJECTS" target="_top">vfs objects = commit</a>
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| 17 | <a class="link" href="smb.conf.5.html#COMMIT:DTHRESH" target="_top">commit:dthresh = 512K</a>
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| 18 | </pre></div><div class="refsect1" lang="en"><a name="id2483675"></a><h2>CAVEATS</h2><p>On some systems, the data synchronization performed by
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| 19 | <code class="literal">commit</code> may reduce performance.
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| 20 | </p></div><div class="refsect1" lang="en"><a name="id2483692"></a><h2>VERSION</h2><p>This man page is correct for version 3.0.25 of the Samba suite.
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| 21 | </p></div><div class="refsect1" lang="en"><a name="id2483703"></a><h2>AUTHOR</h2><p>The original Samba software and related utilities
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| 22 | were created by Andrew Tridgell. Samba is now developed
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| 23 | by the Samba Team as an Open Source project similar
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| 24 | to the way the Linux kernel is developed.</p></div></div></body></html>
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