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1245N/A<
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span class="acronym">BIND</
span> Resource Requirements</
th></
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1245N/A<
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1245N/A<
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1245N/A<
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1245N/A<
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div><
div><
h2 class="title">
1245N/A<
a name="Bv9ARM.ch02"></
a>Chapter�2.�<
span class="acronym">BIND</
span> Resource Requirements</
h2></
div></
div></
div>
1245N/A<
p><
b>Table of Contents</
b></
p>
1245N/A<
dt><
span class="sect1"><
a href="Bv9ARM.ch02.html#id2537051">Name Server Intensive Environment Issues</
a></
span></
dt>
1245N/A<
div class="sect1" lang="en">
1245N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
1245N/A<
a name="id2536987"></
a>Hardware requirements</
h2></
div></
div></
div>
1245N/A <
span class="acronym">DNS</
span> hardware requirements have
1245N/A traditionally been quite modest.
1245N/A For many installations, servers that have been pensioned off from
1245N/A active duty have performed admirably as <
span class="acronym">DNS</
span> servers.
1245N/A The DNSSEC and IPv6 features of <
span class="acronym">BIND</
span> 9
1245N/A CPU intensive however, so organizations that make heavy use of these
1245N/A features may wish to consider larger systems for these applications.
1245N/A <
span class="acronym">BIND</
span> 9 is fully multithreaded, allowing
1245N/A multiprocessor systems for installations that need it.
1245N/A<
div class="sect1" lang="en">
1245N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
1245N/A<
a name="id2537014"></
a>CPU Requirements</
h2></
div></
div></
div>
1245N/A CPU requirements for <
span class="acronym">BIND</
span> 9 range from
1245N/A for serving of static zones without caching, to enterprise-class
1245N/A machines if you intend to process many dynamic updates and DNSSEC
1245N/A signed zones, serving many thousands of queries per second.
1245N/A<
div class="sect1" lang="en">
1245N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
1245N/A<
a name="id2537027"></
a>Memory Requirements</
h2></
div></
div></
div>
1245N/A The memory of the server has to be large enough to fit the
1245N/A cache and zones loaded off disk. The <
span><
strong class="command">max-cache-size</
strong></
span>
1245N/A option can be used to limit the amount of memory used by the cache,
1245N/A at the expense of reducing cache hit rates and causing more <
span class="acronym">DNS</
span>
1245N/A Additionally, if additional section caching
1245N/A (<
a href="Bv9ARM.ch06.html#acache" title="Additional Section Caching">the section called “Additional Section Caching”</
a>) is enabled,
1245N/A the <
span><
strong class="command">max-acache-size</
strong></
span> can be used to
1245N/A of memory used by the mechanism.
1245N/A It is still good practice to have enough memory to load
1245N/A all zone and cache data into memory — unfortunately, the best
1245N/A to determine this for a given installation is to watch the name server
1245N/A in operation. After a few weeks the server process should reach
1245N/A a relatively stable size where entries are expiring from the cache as
1245N/A fast as they are being inserted.
1245N/A<
div class="sect1" lang="en">
1245N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
1245N/A<
a name="id2537051"></
a>Name Server Intensive Environment Issues</
h2></
div></
div></
div>
1245N/A For name server intensive environments, there are two alternative
1245N/A configurations that may be used. The first is where clients and
1245N/A any second-level internal name servers query a main name server, which
1245N/A has enough memory to build a large cache. This approach minimizes
1245N/A the bandwidth used by external name lookups. The second alternative
1245N/A is to set up second-level internal name servers to make queries
1245N/A In this configuration, none of the individual machines needs to
1245N/A have as much memory or CPU power as in the first alternative, but
1245N/A this has the disadvantage of making many more external queries,
1245N/A as none of the name servers share their cached data.
1245N/A<
div class="sect1" lang="en">
1245N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
1245N/A<
a name="id2537130"></
a>Supported Operating Systems</
h2></
div></
div></
div>
1245N/A ISC <
span class="acronym">BIND</
span> 9 compiles and runs on a large
1245N/A of Unix-like operating system and on Windows NT / 2000. For an
1245N/A list of supported systems, see the README file in the top level
1245N/A of the BIND 9 source distribution.
1245N/A<
table width="100%" summary="Navigation footer">
1245N/A<
td width="40%" align="left">
1245N/A<
td width="20%" align="center">�</
td>
1245N/A<
td width="40%" align="left" valign="top">Chapter�1.�Introduction�</
td>
1245N/A<
td width="40%" align="right" valign="top">�Chapter�3.�Name Server Configuration</
td>