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1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>vfs_prealloc</title><link rel="stylesheet" href="samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.68.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en"><a name="vfs_prealloc.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>vfs_prealloc &#8212; preallocate matching files to a predetermined size</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">vfs objects = prealloc</code> </p></div></div><div class="refsect1" lang="en"><a name="id263118"></a><h2>DESCRIPTION</h2><p>This VFS module is part of the
2        <a href="samba.7.html"><span class="citerefentry"><span class="refentrytitle">samba</span>(7)</span></a> suite.</p><p>The <span><strong class="command">vfs_prealloc</strong></span> VFS module preallocates
3        files to a specified size each time a new file is created. This
4        is useful in environments where files are of a predetermined
5        size will be written to a disk subsystem where extending file
6        allocations is expensive.  </p><p>This module is stackable.</p></div><div class="refsect1" lang="en"><a name="id230794"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">prealloc:EXT = BYTES</span></dt><dd><p>Preallocate all files with the extension EXT to
7                the size specified by BYTES.
8                </p><p>The following suffixes may be applied to BYTES:</p><div class="itemizedlist"><ul type="disc"><li><p><span><strong class="command">K</strong></span> - BYTES is a number of kilobytes</p></li><li><p><span><strong class="command">M</strong></span> - BYTES is a number of megabytes</p></li><li><p><span><strong class="command">G</strong></span> - BYTES is a number of gigabytes</p></li></ul></div></dd></dl></div></div><div class="refsect1" lang="en"><a name="id231177"></a><h2>EXAMPLES</h2><p>A process writes TIFF files to a Samba share, and the
9        is known these files will almost always be around 4 megabytes
10        (4194304 bytes): </p><pre class="programlisting">
11        <em class="parameter"><code>[frames]</code></em>
12        <a class="indexterm" name="id231197"></a>path = /data/frames
13        <a class="indexterm" name="id231403"></a>vfs objects = prealloc
14        <a class="indexterm" name="id231411"></a>prealloc:tiff = 4M
15</pre></div><div class="refsect1" lang="en"><a name="id231420"></a><h2>CAVEATS</h2><p><span><strong class="command">vfs_prealloc</strong></span> is not supported on all
16        platforms and filesystems. Currently only XFS filesystems on
17        Linux and IRIX are supported.
18        </p></div><div class="refsect1" lang="en"><a name="id231435"></a><h2>VERSION</h2><p>This man page is correct for version 3.0.25 of the Samba suite.
19        </p></div><div class="refsect1" lang="en"><a name="id231445"></a><h2>AUTHOR</h2><p>The original Samba software and related utilities
20        were created by Andrew Tridgell. Samba is now developed
21        by the Samba Team as an Open Source project similar
22        to the way the Linux kernel is developed.</p></div></div></body></html>
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