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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#id2567594">Hardware requirements</a></span></dt>
 49<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567621">CPU Requirements</a></span></dt>
 50<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567634">Memory Requirements</a></span></dt>
 51<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567729">Name Server Intensive Environment Issues</a></span></dt>
 52<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567739">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="id2567594"></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="id2567621"></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="id2567634"></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="id2567729"></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="id2567739"></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>
138</div>
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149</tr>
150<tr>
151<td width="40%" align="left" valign="top">Chapter 1. Introduction </td>
152<td width="20%" align="center"><a accesskey="h" href="Bv9ARM.html">Home</a></td>
153<td width="40%" align="right" valign="top"> Chapter 3. Name Server Configuration</td>
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