external/bsd/bind/dist/doc/arm/Bv9ARM.ch02.html

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  21 <title>Chapter 2. BIND Resource Requirements</title>
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  31 <tr><th colspan="3" align="center">Chapter 2. <acronym class="acronym">BIND</acronym> Resource Requirements</th></tr>
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  42 <div class="chapter" lang="en">
  43 <div class="titlepage"><div><div><h2 class="title">
  44 <a name="Bv9ARM.ch02"></a>Chapter 2. <acronym class="acronym">BIND</acronym> Resource Requirements</h2></div></div></div>
  45 <div class="toc">
  46 <p><b>Table of Contents</b></p>
  47 <dl>
  48 <dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567685">Hardware requirements</a></span></dt>
  49 <dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567712">CPU Requirements</a></span></dt>
  50 <dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567793">Memory Requirements</a></span></dt>
  51 <dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567819">Name Server Intensive Environment Issues</a></span></dt>
  52 <dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567830">Supported Operating Systems</a></span></dt>
  53 </dl>
  54 </div>
  55 <div class="sect1" lang="en">
  56 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
  57 <a name="id2567685"></a>Hardware requirements</h2></div></div></div>
  58 <p>
  59         <acronym class="acronym">DNS</acronym> hardware requirements have
  60         traditionally been quite modest.
  61         For many installations, servers that have been pensioned off from
  62         active duty have performed admirably as <acronym class="acronym">DNS</acronym> servers.
  63       </p>
  64 <p>
  65         The DNSSEC features of <acronym class="acronym">BIND</acronym> 9
  66         may prove to be quite
  67         CPU intensive however, so organizations that make heavy use of these
  68         features may wish to consider larger systems for these applications.
  69         <acronym class="acronym">BIND</acronym> 9 is fully multithreaded, allowing
  70         full utilization of
  71         multiprocessor systems for installations that need it.
  72       </p>
  73 </div>
  74 <div class="sect1" lang="en">
  75 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
  76 <a name="id2567712"></a>CPU Requirements</h2></div></div></div>
  77 <p>
  78         CPU requirements for <acronym class="acronym">BIND</acronym> 9 range from
  79         i486-class machines
  80         for serving of static zones without caching, to enterprise-class
  81         machines if you intend to process many dynamic updates and DNSSEC
  82         signed zones, serving many thousands of queries per second.
  83       </p>
  84 </div>
  85 <div class="sect1" lang="en">
  86 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
  87 <a name="id2567793"></a>Memory Requirements</h2></div></div></div>
  88 <p>
  89         The memory of the server has to be large enough to fit the
  90         cache and zones loaded off disk.  The <span><strong class="command">max-cache-size</strong></span>
  91         option can be used to limit the amount of memory used by the cache,
  92         at the expense of reducing cache hit rates and causing more <acronym class="acronym">DNS</acronym>
  93         traffic.
  94         Additionally, if additional section caching
  95         (<a href="Bv9ARM.ch06.html#acache" title="Additional Section Caching">the section called &#8220;Additional Section Caching&#8221;</a>) is enabled,
  96         the <span><strong class="command">max-acache-size</strong></span> option can be used to
  97         limit the amount
  98         of memory used by the mechanism.
  99         It is still good practice to have enough memory to load
 100         all zone and cache data into memory &#8212; unfortunately, the best
 101         way
 102         to determine this for a given installation is to watch the name server
 103         in operation. After a few weeks the server process should reach
 104         a relatively stable size where entries are expiring from the cache as
 105         fast as they are being inserted.
 106       </p>
 107 </div>
 108 <div class="sect1" lang="en">
 109 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
 110 <a name="id2567819"></a>Name Server Intensive Environment Issues</h2></div></div></div>
 111 <p>
 112         For name server intensive environments, there are two alternative
 113         configurations that may be used. The first is where clients and
 114         any second-level internal name servers query a main name server, which
 115         has enough memory to build a large cache. This approach minimizes
 116         the bandwidth used by external name lookups. The second alternative
 117         is to set up second-level internal name servers to make queries
 118         independently.
 119         In this configuration, none of the individual machines needs to
 120         have as much memory or CPU power as in the first alternative, but
 121         this has the disadvantage of making many more external queries,
 122         as none of the name servers share their cached data.
 123       </p>
 124 </div>
 125 <div class="sect1" lang="en">
 126 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
 127 <a name="id2567830"></a>Supported Operating Systems</h2></div></div></div>
 128 <p>
 129         ISC <acronym class="acronym">BIND</acronym> 9 compiles and runs on a large
 130         number
 131         of Unix-like operating systems and on
 132         Microsoft Windows Server 2003 and 2008, and Windows XP and Vista.
 133         For an up-to-date
 134         list of supported systems, see the README file in the top level
 135         directory
 136         of the BIND 9 source distribution.
 137       </p>
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