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42 <div class="titlepage"><div><div><h1 class="title">
43 <a name="Bv9ARM.ch02"></a>Chapter 2. <acronym class="acronym">BIND</acronym> Resource Requirements</h1></div></div></div>
45 <p><b>Table of Contents</b></p>
47 <dt><span class="section"><a href="Bv9ARM.ch02.html#hw_req">Hardware requirements</a></span></dt>
48 <dt><span class="section"><a href="Bv9ARM.ch02.html#cpu_req">CPU Requirements</a></span></dt>
49 <dt><span class="section"><a href="Bv9ARM.ch02.html#mem_req">Memory Requirements</a></span></dt>
50 <dt><span class="section"><a href="Bv9ARM.ch02.html#intensive_env">Name Server Intensive Environment Issues</a></span></dt>
51 <dt><span class="section"><a href="Bv9ARM.ch02.html#supported_os">Supported Operating Systems</a></span></dt>
55 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
56 <a name="hw_req"></a>Hardware requirements</h2></div></div></div>
58 <acronym class="acronym">DNS</acronym> hardware requirements have
59 traditionally been quite modest.
60 For many installations, servers that have been pensioned off from
61 active duty have performed admirably as <acronym class="acronym">DNS</acronym> servers.
64 The DNSSEC features of <acronym class="acronym">BIND</acronym> 9
66 CPU intensive however, so organizations that make heavy use of these
67 features may wish to consider larger systems for these applications.
68 <acronym class="acronym">BIND</acronym> 9 is fully multithreaded, allowing
70 multiprocessor systems for installations that need it.
74 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
75 <a name="cpu_req"></a>CPU Requirements</h2></div></div></div>
77 CPU requirements for <acronym class="acronym">BIND</acronym> 9 range from
79 for serving of static zones without caching, to enterprise-class
80 machines if you intend to process many dynamic updates and DNSSEC
81 signed zones, serving many thousands of queries per second.
85 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
86 <a name="mem_req"></a>Memory Requirements</h2></div></div></div>
88 The memory of the server has to be large enough to fit the
89 cache and zones loaded off disk. The <span class="command"><strong>max-cache-size</strong></span>
90 option can be used to limit the amount of memory used by the cache,
91 at the expense of reducing cache hit rates and causing more <acronym class="acronym">DNS</acronym>
93 Additionally, if additional section caching
94 (<a class="xref" href="Bv9ARM.ch06.html#acache" title="Additional Section Caching">the section called “Additional Section Caching”</a>) is enabled,
95 the <span class="command"><strong>max-acache-size</strong></span> option can be used to
97 of memory used by the mechanism.
98 It is still good practice to have enough memory to load
99 all zone and cache data into memory — unfortunately, the best
101 to determine this for a given installation is to watch the name server
102 in operation. After a few weeks the server process should reach
103 a relatively stable size where entries are expiring from the cache as
104 fast as they are being inserted.
107 <div class="section">
108 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
109 <a name="intensive_env"></a>Name Server Intensive Environment Issues</h2></div></div></div>
111 For name server intensive environments, there are two alternative
112 configurations that may be used. The first is where clients and
113 any second-level internal name servers query a main name server, which
114 has enough memory to build a large cache. This approach minimizes
115 the bandwidth used by external name lookups. The second alternative
116 is to set up second-level internal name servers to make queries
118 In this configuration, none of the individual machines needs to
119 have as much memory or CPU power as in the first alternative, but
120 this has the disadvantage of making many more external queries,
121 as none of the name servers share their cached data.
124 <div class="section">
125 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
126 <a name="supported_os"></a>Supported Operating Systems</h2></div></div></div>
128 ISC <acronym class="acronym">BIND</acronym> 9 compiles and runs on a large
130 of Unix-like operating systems and on
131 Microsoft Windows Server 2003 and 2008, and Windows XP and Vista.
133 list of supported systems, see the README file in the top level
135 of the BIND 9 source distribution.
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152 <td width="40%" align="right" valign="top"> Chapter 3. Name Server Configuration</td>
156 <p xmlns:db="http://docbook.org/ns/docbook" style="text-align: center;">BIND 9.9.9-P4 (Extended Support Version)</p>