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Code Editor : storage-backends.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Storage backends — Varnish version 5.2.1 documentation</title> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '5.2.1', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="top" title="Varnish version 5.2.1 documentation" href="../index.html" /> <link rel="up" title="Starting and running Varnish" href="running.html" /> <link rel="next" title="Parameters" href="params.html" /> <link rel="prev" title="CLI - bossing Varnish around" href="run_cli.html" /> </head> <body role="document"> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="params.html" title="Parameters" accesskey="N">next</a> |</li> <li class="right" > <a href="run_cli.html" title="CLI - bossing Varnish around" accesskey="P">previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Varnish version 5.2.1 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" >The Varnish Users Guide</a> »</li> <li class="nav-item nav-item-2"><a href="running.html" accesskey="U">Starting and running Varnish</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="storage-backends"> <span id="guide-storage"></span><h1>Storage backends<a class="headerlink" href="#storage-backends" title="Permalink to this headline">¶</a></h1> <div class="section" id="intro"> <h2>Intro<a class="headerlink" href="#intro" title="Permalink to this headline">¶</a></h2> <p>Varnish has pluggable storage backends. It can store data in various backends which can have different performance characteristics. The default configuration is to use the malloc backend with a limited size. For a serious Varnish deployment you probably would want to adjust the storage settings.</p> </div> <div class="section" id="malloc"> <h2>malloc<a class="headerlink" href="#malloc" title="Permalink to this headline">¶</a></h2> <p>syntax: malloc[,size]</p> <p>Malloc is a memory based backend. Each object will be allocated from memory. If your system runs low on memory swap will be used.</p> <p>Be aware that the size limitation only limits the actual storage and that the approximately 1k of memory per object, used for various internal structures, is included in the actual storage as well.</p> <p>The size parameter specifies the maximum amount of memory <cite>varnishd</cite> will allocate. The size is assumed to be in bytes, unless followed by one of the following suffixes:</p> <blockquote> <div><p>K, k The size is expressed in kibibytes.</p> <p>M, m The size is expressed in mebibytes.</p> <p>G, g The size is expressed in gibibytes.</p> <p>T, t The size is expressed in tebibytes.</p> </div></blockquote> <p>The default size is unlimited.</p> <p>malloc's performance is bound to memory speed so it is very fast. If the dataset is bigger than available memory performance will depend on the operating systems ability to page effectively.</p> </div> <div class="section" id="file"> <h2>file<a class="headerlink" href="#file" title="Permalink to this headline">¶</a></h2> <p>syntax: file,path[,size[,granularity[,advice]]]</p> <p>The file backend stores objects in memory backed by an unlinked file on disk with <cite>mmap</cite>.</p> <p>The 'path' parameter specifies either the path to the backing file or the path to a directory in which <cite>varnishd</cite> will create the backing file.</p> <p>The size parameter specifies the size of the backing file. The size is assumed to be in bytes, unless followed by one of the following suffixes:</p> <blockquote> <div><p>K, k The size is expressed in kibibytes.</p> <p>M, m The size is expressed in mebibytes.</p> <p>G, g The size is expressed in gibibytes.</p> <p>T, t The size is expressed in tebibytes.</p> </div></blockquote> <p>If 'path' points to an existing file and no size is specified, the size of the existing file will be used. If 'path' does not point to an existing file it is an error to not specify the size.</p> <p>If the backing file already exists, it will be truncated or expanded to the specified size.</p> <p>Note that if <cite>varnishd</cite> has to create or expand the file, it will not pre-allocate the added space, leading to fragmentation, which may adversely impact performance on rotating hard drives. Pre-creating the storage file using <cite>dd(1)</cite> will reduce fragmentation to a minimum.</p> <p>The 'granularity' parameter specifies the granularity of allocation. All allocations are rounded up to this size. The granularity is is assumed to be expressed in bytes, unless followed by one of the suffixes described for size.</p> <p>The default granularity is the VM page size. The size should be reduced if you have many small objects.</p> <p>File performance is typically limited to the write speed of the device, and depending on use, the seek time.</p> <p>The 'advice' parameter tells the kernel how <cite>varnishd</cite> expects to use this mapped region so that the kernel can choose the appropriate read-ahead and caching techniques. Possible values are <code class="docutils literal"><span class="pre">normal</span></code>, <code class="docutils literal"><span class="pre">random</span></code> and <code class="docutils literal"><span class="pre">sequential</span></code>, corresponding to MADV_NORMAL, MADV_RANDOM and MADV_SEQUENTIAL madvise() advice argument, respectively. Defaults to <code class="docutils literal"><span class="pre">random</span></code>.</p> <p>On Linux, large objects and rotational disk should benefit from "sequential".</p> </div> <div class="section" id="persistent-experimental"> <h2>persistent (experimental)<a class="headerlink" href="#persistent-experimental" title="Permalink to this headline">¶</a></h2> <p>syntax: persistent,path,size {experimental}</p> <p>Persistent storage. Varnish will store objects in a file in a manner that will secure the survival of <em>most</em> of the objects in the event of a planned or unplanned shutdown of Varnish.</p> <p>The 'path' parameter specifies the path to the backing file. If the file doesn't exist Varnish will create it.</p> <p>The 'size' parameter specifies the size of the backing file. The size is expressed in bytes, unless followed by one of the following suffixes:</p> <blockquote> <div><p>K, k The size is expressed in kibibytes.</p> <p>M, m The size is expressed in mebibytes.</p> <p>G, g The size is expressed in gibibytes.</p> <p>T, t The size is expressed in tebibytes.</p> </div></blockquote> <p>Varnish will split the file into logical <em>silos</em> and write to the silos in the manner of a circular buffer. Only one silo will be kept open at any given point in time. Full silos are <em>sealed</em>. When Varnish starts after a shutdown it will discard the content of any silo that isn't sealed.</p> <p>Note that taking persistent silos offline and at the same time using bans can cause problems. This is due to the fact that bans added while the silo was offline will not be applied to the silo when it reenters the cache. Consequently enabling previously banned objects to reappear.</p> </div> </div> <div class="section" id="transient-storage"> <h1>Transient Storage<a class="headerlink" href="#transient-storage" title="Permalink to this headline">¶</a></h1> <p>If you name any of your storage backend "Transient" it will be used for transient (short lived) objects. This includes the temporary objects created when returning a synthetic object. By default Varnish would use an unlimited malloc backend for this.</p> <p>Varnish will consider an object short lived if the TTL is below the parameter 'shortlived'.</p> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../index.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">Storage backends</a><ul> <li><a class="reference internal" href="#intro">Intro</a></li> <li><a class="reference internal" href="#malloc">malloc</a></li> <li><a class="reference internal" href="#file">file</a></li> <li><a class="reference internal" href="#persistent-experimental">persistent (experimental)</a></li> </ul> </li> <li><a class="reference internal" href="#transient-storage">Transient Storage</a></li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="run_cli.html" title="previous chapter">CLI - bossing Varnish around</a></p> <h4>Next topic</h4> <p class="topless"><a href="params.html" title="next chapter">Parameters</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/users-guide/storage-backends.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <div><input type="text" name="q" /></div> <div><input type="submit" value="Go" /></div> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="params.html" title="Parameters" >next</a> |</li> <li class="right" > <a href="run_cli.html" title="CLI - bossing Varnish around" >previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Varnish version 5.2.1 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" >The Varnish Users Guide</a> »</li> <li class="nav-item nav-item-2"><a href="running.html" >Starting and running Varnish</a> »</li> </ul> </div> <div class="footer" role="contentinfo"> © Copyright 2010-2014, Varnish Software AS. 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