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-<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>vfs_cacheprime</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" title="vfs_cacheprime"><a name="vfs_cacheprime.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>vfs_cacheprime &#8212; prime the kernel file data cache</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="literal">vfs objects = cacheprime</code></p></div></div><div class="refsect1" title="DESCRIPTION"><a name="id266341"></a><h2>DESCRIPTION</h2><p>This VFS module is part of the
- <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_cacheprime</code> VFS module reads chunks
- of file data near the range requested by clients in order to
- make sure the data is present in the kernel file data cache at
- the time when it is actually requested by clients. </p><p>The size of the disk read operations performed
- by <code class="literal">vfs_cacheprime</code> is determined by the
- cacheprime:rsize option. All disk read operations are aligned
- on boundaries that are a multiple of this size. Each range of
- the file data is primed at most once during the time the client
- has the file open. </p><p>This module is stackable.</p></div><div class="refsect1" title="OPTIONS"><a name="id266840"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">cacheprime:rsize = BYTES</span></dt><dd><p>The number of bytes with which to prime
- the kernel data cache.</p><p>The following suffixes may be applied to BYTES:</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><code class="literal">K</code> - BYTES is a number of kilobytes</p></li><li class="listitem"><p><code class="literal">M</code> - BYTES is a number of megabytes</p></li><li class="listitem"><p><code class="literal">G</code> - BYTES is a number of gigabytes</p></li></ul></div></dd></dl></div></div><div class="refsect1" title="EXAMPLES"><a name="id266897"></a><h2>EXAMPLES</h2><p>For a hypothetical disk array, it is necessary to ensure
- that all read operations are of size 1 megabyte (1048576 bytes),
- and aligned on 1 megabyte boundaries:
- </p><pre class="programlisting">
- <em class="parameter"><code>[hypothetical]</code></em>
- <a class="link" href="smb.conf.5.html#VFSOBJECTS" target="_top">vfs objects = cacheprime</a>
- <a class="link" href="smb.conf.5.html#CACHEPRIME:RSIZE" target="_top">cacheprime:rsize = 1M</a>
-</pre></div><div class="refsect1" title="CAVEATS"><a name="id265839"></a><h2>CAVEATS</h2><p><code class="literal">cacheprime</code> is not a a substitute for
- a general-purpose readahead mechanism. It is intended for use
- only in very specific environments where disk operations must
- be aligned and sized to known values (as much as that is possible).
- </p></div><div class="refsect1" title="VERSION"><a name="id265855"></a><h2>VERSION</h2><p>This man page is correct for version 3.0.25 of the Samba suite.
- </p></div><div class="refsect1" title="AUTHOR"><a name="id265865"></a><h2>AUTHOR</h2><p>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.</p></div></div></body></html>