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5972N/A<
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acronym class="acronym">BIND</
acronym> Resource Requirements</
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1244N/A<
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618N/A<
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346N/A<
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h2 class="title">
346N/A<
a name="Bv9ARM.ch02"></
a>Chapter�2.�<
acronym class="acronym">BIND</
acronym> Resource Requirements</
h2></
div></
div></
div>
346N/A<
p><
b>Table of Contents</
b></
p>
4194N/A<
dt><
span class="sect1"><
a href="Bv9ARM.ch02.html#id2567729">Name Server Intensive Environment Issues</
a></
span></
dt>
346N/A<
div class="sect1" lang="en">
346N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
4162N/A<
a name="id2567594"></
a>Hardware requirements</
h2></
div></
div></
div>
4162N/A <
acronym class="acronym">DNS</
acronym> hardware requirements have
618N/A traditionally been quite modest.
4194N/A For many installations, servers that have been pensioned off from
4194N/A active duty have performed admirably as <
acronym class="acronym">DNS</
acronym> servers.
3083N/A The DNSSEC features of <
acronym class="acronym">BIND</
acronym> 9
5680N/A CPU intensive however, so organizations that make heavy use of these
346N/A features may wish to consider larger systems for these applications.
5680N/A <
acronym class="acronym">BIND</
acronym> 9 is fully multithreaded, allowing
5680N/A multiprocessor systems for installations that need it.
346N/A<
div class="sect1" lang="en">
346N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
4162N/A<
a name="id2567621"></
a>CPU Requirements</
h2></
div></
div></
div>
4162N/A CPU requirements for <
acronym class="acronym">BIND</
acronym> 9 range from
346N/A for serving of static zones without caching, to enterprise-class
346N/A machines if you intend to process many dynamic updates and DNSSEC
346N/A signed zones, serving many thousands of queries per second.
351N/A<
div class="sect1" lang="en">
4162N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
4162N/A<
a name="id2567634"></
a>Memory Requirements</
h2></
div></
div></
div>
351N/A The memory of the server has to be large enough to fit the
4162N/A cache and zones loaded off disk. The <
span><
strong class="command">max-cache-size</
strong></
span>
4162N/A option can be used to limit the amount of memory used by the cache,
6453N/A at the expense of reducing cache hit rates and causing more <
acronym class="acronym">DNS</
acronym>
6453N/A Additionally, if additional section caching
6453N/A (<
a href="Bv9ARM.ch06.html#acache" title="Additional Section Caching">the section called “Additional Section Caching”</
a>) is enabled,
6453N/A the <
span><
strong class="command">max-acache-size</
strong></
span> option can be used to
6453N/A of memory used by the mechanism.
6453N/A It is still good practice to have enough memory to load
6453N/A all zone and cache data into memory — unfortunately, the best
6453N/A to determine this for a given installation is to watch the name server
4162N/A in operation. After a few weeks the server process should reach
4162N/A a relatively stable size where entries are expiring from the cache as
346N/A fast as they are being inserted.
2497N/A<
div class="sect1" lang="en">
2497N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
2497N/A<
a name="id2567729"></
a>Name Server Intensive Environment Issues</
h2></
div></
div></
div>
3958N/A For name server intensive environments, there are two alternative
3958N/A configurations that may be used. The first is where clients and
3958N/A any second-level internal name servers query a main name server, which
3958N/A has enough memory to build a large cache. This approach minimizes
5680N/A the bandwidth used by external name lookups. The second alternative
4760N/A is to set up second-level internal name servers to make queries
5680N/A In this configuration, none of the individual machines needs to
5680N/A have as much memory or CPU power as in the first alternative, but
2497N/A this has the disadvantage of making many more external queries,
5680N/A as none of the name servers share their cached data.
6453N/A<
div class="sect1" lang="en">
3817N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
3817N/A<
a name="id2567739"></
a>Supported Operating Systems</
h2></
div></
div></
div>
4162N/A ISC <
acronym class="acronym">BIND</
acronym> 9 compiles and runs on a large
3817N/A of Unix-like operating systems and on
6453N/A Microsoft Windows Server 2003 and 2008, and Windows XP and Vista.
3817N/A list of supported systems, see the README file in the top level
of the BIND 9 source distribution.
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