docs-xml/manpages/vfs_prealloc.8.xml

   1 <?xml version="1.0" encoding="iso-8859-1"?>
   2 <!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
   3 <refentry id="vfs_prealloc.8">
   4
   5 <refmeta>
   6         <refentrytitle>vfs_prealloc</refentrytitle>
   7         <manvolnum>8</manvolnum>
   8         <refmiscinfo class="source">Samba</refmiscinfo>
   9         <refmiscinfo class="manual">System Administration tools</refmiscinfo>
  10         <refmiscinfo class="version">4.7</refmiscinfo>
  11 </refmeta>
  12
  13
  14 <refnamediv>
  15         <refname>vfs_prealloc</refname>
  16         <refpurpose>preallocate matching files to a predetermined size</refpurpose>
  17 </refnamediv>
  18
  19 <refsynopsisdiv>
  20         <cmdsynopsis>
  21                 <command>vfs objects = prealloc</command>
  22         </cmdsynopsis>
  23 </refsynopsisdiv>
  24
  25 <refsect1>
  26         <title>DESCRIPTION</title>
  27
  28         <para>This VFS module is part of the
  29         <citerefentry><refentrytitle>samba</refentrytitle>
  30         <manvolnum>7</manvolnum></citerefentry> suite.</para>
  31
  32         <para>The <command>vfs_prealloc</command> VFS module preallocates
  33         files to a specified size each time a new file is created. This
  34         is useful in environments where files are of a predetermined
  35         size will be written to a disk subsystem where extending file
  36         allocations is expensive.  </para>
  37
  38         <para>This module is stackable.</para>
  39
  40 </refsect1>
  41
  42
  43 <refsect1>
  44         <title>OPTIONS</title>
  45
  46         <variablelist>
  47
  48                 <varlistentry>
  49                 <term>prealloc:EXT = BYTES</term>
  50                 <listitem>
  51                 <para>Preallocate all files with the extension EXT to
  52                 the size specified by BYTES.
  53                 </para>
  54
  55                 <para>The following suffixes may be applied to BYTES:</para>
  56                 <itemizedlist>
  57                 <listitem><para><command>K</command> - BYTES is a number of kilobytes</para></listitem>
  58                 <listitem><para><command>M</command> - BYTES is a number of megabytes</para></listitem>
  59                 <listitem><para><command>G</command> - BYTES is a number of gigabytes</para></listitem>
  60                 </itemizedlist>
  61
  62                 </listitem>
  63                 </varlistentry>
  64
  65         </variablelist>
  66 </refsect1>
  67
  68 <refsect1>
  69         <title>EXAMPLES</title>
  70
  71         <para>A process writes TIFF files to a Samba share, and the
  72         is known these files will almost always be around 4 megabytes
  73         (4194304 bytes): </para>
  74
  75 <programlisting>
  76         <smbconfsection name="[frames]"/>
  77         <smbconfoption name="path">/data/frames</smbconfoption>
  78         <smbconfoption name="vfs objects">prealloc</smbconfoption>
  79         <smbconfoption name="prealloc:tiff">4M</smbconfoption>
  80 </programlisting>
  81 </refsect1>
  82
  83 <refsect1>
  84         <title>CAVEATS</title>
  85         <para><command>vfs_prealloc</command> is not supported on all
  86         platforms and filesystems. Currently only XFS filesystems on
  87         Linux and IRIX are supported.
  88         </para>
  89 </refsect1>
  90
  91 <refsect1>
  92         <title>VERSION</title>
  93         <para>This man page is correct for version 3.0.25 of the Samba suite.
  94         </para>
  95 </refsect1>
  96
  97 <refsect1>
  98         <title>AUTHOR</title>
  99
 100         <para>The original Samba software and related utilities
 101         were created by Andrew Tridgell. Samba is now developed
 102         by the Samba Team as an Open Source project similar
 103         to the way the Linux kernel is developed.</para>
 104
 105 </refsect1>
 106
 107 </refentry>