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21*00b67f09SDavid van Moolenbroek<title>Chapter�2.�BIND Resource Requirements</title>
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31*00b67f09SDavid van Moolenbroek<tr><th colspan="3" align="center">Chapter�2.�<acronym class="acronym">BIND</acronym> Resource Requirements</th></tr>
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42*00b67f09SDavid van Moolenbroek<div class="chapter" lang="en">
43*00b67f09SDavid van Moolenbroek<div class="titlepage"><div><div><h2 class="title">
44*00b67f09SDavid van Moolenbroek<a name="Bv9ARM.ch02"></a>Chapter�2.�<acronym class="acronym">BIND</acronym> Resource Requirements</h2></div></div></div>
45*00b67f09SDavid van Moolenbroek<div class="toc">
46*00b67f09SDavid van Moolenbroek<p><b>Table of Contents</b></p>
47*00b67f09SDavid van Moolenbroek<dl>
48*00b67f09SDavid van Moolenbroek<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567685">Hardware requirements</a></span></dt>
49*00b67f09SDavid van Moolenbroek<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567712">CPU Requirements</a></span></dt>
50*00b67f09SDavid van Moolenbroek<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567793">Memory Requirements</a></span></dt>
51*00b67f09SDavid van Moolenbroek<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567819">Name Server Intensive Environment Issues</a></span></dt>
52*00b67f09SDavid van Moolenbroek<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567830">Supported Operating Systems</a></span></dt>
53*00b67f09SDavid van Moolenbroek</dl>
54*00b67f09SDavid van Moolenbroek</div>
55*00b67f09SDavid van Moolenbroek<div class="sect1" lang="en">
56*00b67f09SDavid van Moolenbroek<div class="titlepage"><div><div><h2 class="title" style="clear: both">
57*00b67f09SDavid van Moolenbroek<a name="id2567685"></a>Hardware requirements</h2></div></div></div>
58*00b67f09SDavid van Moolenbroek<p>
59*00b67f09SDavid van Moolenbroek        <acronym class="acronym">DNS</acronym> hardware requirements have
60*00b67f09SDavid van Moolenbroek        traditionally been quite modest.
61*00b67f09SDavid van Moolenbroek        For many installations, servers that have been pensioned off from
62*00b67f09SDavid van Moolenbroek        active duty have performed admirably as <acronym class="acronym">DNS</acronym> servers.
63*00b67f09SDavid van Moolenbroek      </p>
64*00b67f09SDavid van Moolenbroek<p>
65*00b67f09SDavid van Moolenbroek        The DNSSEC features of <acronym class="acronym">BIND</acronym> 9
66*00b67f09SDavid van Moolenbroek        may prove to be quite
67*00b67f09SDavid van Moolenbroek        CPU intensive however, so organizations that make heavy use of these
68*00b67f09SDavid van Moolenbroek        features may wish to consider larger systems for these applications.
69*00b67f09SDavid van Moolenbroek        <acronym class="acronym">BIND</acronym> 9 is fully multithreaded, allowing
70*00b67f09SDavid van Moolenbroek        full utilization of
71*00b67f09SDavid van Moolenbroek        multiprocessor systems for installations that need it.
72*00b67f09SDavid van Moolenbroek      </p>
73*00b67f09SDavid van Moolenbroek</div>
74*00b67f09SDavid van Moolenbroek<div class="sect1" lang="en">
75*00b67f09SDavid van Moolenbroek<div class="titlepage"><div><div><h2 class="title" style="clear: both">
76*00b67f09SDavid van Moolenbroek<a name="id2567712"></a>CPU Requirements</h2></div></div></div>
77*00b67f09SDavid van Moolenbroek<p>
78*00b67f09SDavid van Moolenbroek        CPU requirements for <acronym class="acronym">BIND</acronym> 9 range from
79*00b67f09SDavid van Moolenbroek        i486-class machines
80*00b67f09SDavid van Moolenbroek        for serving of static zones without caching, to enterprise-class
81*00b67f09SDavid van Moolenbroek        machines if you intend to process many dynamic updates and DNSSEC
82*00b67f09SDavid van Moolenbroek        signed zones, serving many thousands of queries per second.
83*00b67f09SDavid van Moolenbroek      </p>
84*00b67f09SDavid van Moolenbroek</div>
85*00b67f09SDavid van Moolenbroek<div class="sect1" lang="en">
86*00b67f09SDavid van Moolenbroek<div class="titlepage"><div><div><h2 class="title" style="clear: both">
87*00b67f09SDavid van Moolenbroek<a name="id2567793"></a>Memory Requirements</h2></div></div></div>
88*00b67f09SDavid van Moolenbroek<p>
89*00b67f09SDavid van Moolenbroek        The memory of the server has to be large enough to fit the
90*00b67f09SDavid van Moolenbroek        cache and zones loaded off disk.  The <span><strong class="command">max-cache-size</strong></span>
91*00b67f09SDavid van Moolenbroek        option can be used to limit the amount of memory used by the cache,
92*00b67f09SDavid van Moolenbroek        at the expense of reducing cache hit rates and causing more <acronym class="acronym">DNS</acronym>
93*00b67f09SDavid van Moolenbroek        traffic.
94*00b67f09SDavid van Moolenbroek        Additionally, if additional section caching
95*00b67f09SDavid van Moolenbroek        (<a href="Bv9ARM.ch06.html#acache" title="Additional Section Caching">the section called &#8220;Additional Section Caching&#8221;</a>) is enabled,
96*00b67f09SDavid van Moolenbroek        the <span><strong class="command">max-acache-size</strong></span> option can be used to
97*00b67f09SDavid van Moolenbroek        limit the amount
98*00b67f09SDavid van Moolenbroek        of memory used by the mechanism.
99*00b67f09SDavid van Moolenbroek        It is still good practice to have enough memory to load
100*00b67f09SDavid van Moolenbroek        all zone and cache data into memory &#8212; unfortunately, the best
101*00b67f09SDavid van Moolenbroek        way
102*00b67f09SDavid van Moolenbroek        to determine this for a given installation is to watch the name server
103*00b67f09SDavid van Moolenbroek        in operation. After a few weeks the server process should reach
104*00b67f09SDavid van Moolenbroek        a relatively stable size where entries are expiring from the cache as
105*00b67f09SDavid van Moolenbroek        fast as they are being inserted.
106*00b67f09SDavid van Moolenbroek      </p>
107*00b67f09SDavid van Moolenbroek</div>
108*00b67f09SDavid van Moolenbroek<div class="sect1" lang="en">
109*00b67f09SDavid van Moolenbroek<div class="titlepage"><div><div><h2 class="title" style="clear: both">
110*00b67f09SDavid van Moolenbroek<a name="id2567819"></a>Name Server Intensive Environment Issues</h2></div></div></div>
111*00b67f09SDavid van Moolenbroek<p>
112*00b67f09SDavid van Moolenbroek        For name server intensive environments, there are two alternative
113*00b67f09SDavid van Moolenbroek        configurations that may be used. The first is where clients and
114*00b67f09SDavid van Moolenbroek        any second-level internal name servers query a main name server, which
115*00b67f09SDavid van Moolenbroek        has enough memory to build a large cache. This approach minimizes
116*00b67f09SDavid van Moolenbroek        the bandwidth used by external name lookups. The second alternative
117*00b67f09SDavid van Moolenbroek        is to set up second-level internal name servers to make queries
118*00b67f09SDavid van Moolenbroek        independently.
119*00b67f09SDavid van Moolenbroek        In this configuration, none of the individual machines needs to
120*00b67f09SDavid van Moolenbroek        have as much memory or CPU power as in the first alternative, but
121*00b67f09SDavid van Moolenbroek        this has the disadvantage of making many more external queries,
122*00b67f09SDavid van Moolenbroek        as none of the name servers share their cached data.
123*00b67f09SDavid van Moolenbroek      </p>
124*00b67f09SDavid van Moolenbroek</div>
125*00b67f09SDavid van Moolenbroek<div class="sect1" lang="en">
126*00b67f09SDavid van Moolenbroek<div class="titlepage"><div><div><h2 class="title" style="clear: both">
127*00b67f09SDavid van Moolenbroek<a name="id2567830"></a>Supported Operating Systems</h2></div></div></div>
128*00b67f09SDavid van Moolenbroek<p>
129*00b67f09SDavid van Moolenbroek        ISC <acronym class="acronym">BIND</acronym> 9 compiles and runs on a large
130*00b67f09SDavid van Moolenbroek        number
131*00b67f09SDavid van Moolenbroek        of Unix-like operating systems and on
132*00b67f09SDavid van Moolenbroek        Microsoft Windows Server 2003 and 2008, and Windows XP and Vista.
133*00b67f09SDavid van Moolenbroek        For an up-to-date
134*00b67f09SDavid van Moolenbroek        list of supported systems, see the README file in the top level
135*00b67f09SDavid van Moolenbroek        directory
136*00b67f09SDavid van Moolenbroek        of the BIND 9 source distribution.
137*00b67f09SDavid van Moolenbroek      </p>
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