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acronym class="acronym">BIND</
acronym> Resource Requirements</
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0N/A<
dt><
span class="section"><
a href="Bv9ARM.ch02.html#hw_req">Hardware requirements</
a></
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0N/A<
dt><
span class="section"><
a href="Bv9ARM.ch02.html#mem_req">Memory Requirements</
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0N/A<
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span class="section"><
a href="Bv9ARM.ch02.html#intensive_env">Name Server Intensive Environment Issues</
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0N/A<
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span class="section"><
a href="Bv9ARM.ch02.html#supported_os">Supported Operating Systems</
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0N/A <
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0N/A<
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h2 class="title" style="clear: both">
0N/A<
a name="hw_req"></
a>Hardware requirements</
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0N/A <
acronym class="acronym">DNS</
acronym> hardware requirements have
0N/A traditionally been quite modest.
0N/A For many installations, servers that have been pensioned off from
0N/A active duty have performed admirably as <
acronym class="acronym">DNS</
acronym> servers.
0N/A The DNSSEC features of <
acronym class="acronym">BIND</
acronym> 9
0N/A may prove to be quite
0N/A CPU intensive however, so organizations that make heavy use of these
0N/A features may wish to consider larger systems for these applications.
0N/A <
acronym class="acronym">BIND</
acronym> 9 is fully multithreaded, allowing
0N/A multiprocessor systems for installations that need it.
0N/A <
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0N/A<
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h2 class="title" style="clear: both">
0N/A<
a name="cpu_req"></
a>CPU Requirements</
h2></
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0N/A CPU requirements for <
acronym class="acronym">BIND</
acronym> 9 range from
0N/A for serving of static zones without caching, to enterprise-class
0N/A machines if you intend to process many dynamic updates and DNSSEC
0N/A signed zones, serving many thousands of queries per second.
0N/A <
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0N/A<
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h2 class="title" style="clear: both">
0N/A<
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a>Memory Requirements</
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0N/A The memory of the server has to be large enough to fit the
0N/A cache and zones loaded off disk. The <
span class="command"><
strong>max-cache-size</
strong></
span>
0N/A option can be used to limit the amount of memory used by the cache,
0N/A at the expense of reducing cache hit rates and causing more <
acronym class="acronym">DNS</
acronym>
0N/A Additionally, if additional section caching
0N/A (<
a class="xref" href="Bv9ARM.ch06.html#acache" title="Additional Section Caching">the section called “Additional Section Caching”</
a>) is enabled,
0N/A the <
span class="command"><
strong>max-acache-size</
strong></
span> option can be used to
0N/A of memory used by the mechanism.
0N/A It is still good practice to have enough memory to load
0N/A all zone and cache data into memory — unfortunately, the best
0N/A to determine this for a given installation is to watch the name server
0N/A in operation. After a few weeks the server process should reach
0N/A a relatively stable size where entries are expiring from the cache as
0N/A fast as they are being inserted.
0N/A <
div class="section">
0N/A<
div class="titlepage"><
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h2 class="title" style="clear: both">
0N/A<
a name="intensive_env"></
a>Name Server Intensive Environment Issues</
h2></
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div>
0N/A For name server intensive environments, there are two alternative
0N/A configurations that may be used. The first is where clients and
0N/A any second-level internal name servers query a main name server, which
0N/A has enough memory to build a large cache. This approach minimizes
0N/A the bandwidth used by external name lookups. The second alternative
0N/A is to set up second-level internal name servers to make queries
0N/A In this configuration, none of the individual machines needs to
0N/A have as much memory or CPU power as in the first alternative, but
0N/A this has the disadvantage of making many more external queries,
0N/A as none of the name servers share their cached data.
0N/A <
div class="section">
0N/A<
div class="titlepage"><
div><
div><
h2 class="title" style="clear: both">
0N/A<
a name="supported_os"></
a>Supported Operating Systems</
h2></
div></
div></
div>
0N/A ISC <
acronym class="acronym">BIND</
acronym> 9 compiles and runs on a large
0N/A of Unix-like operating systems and on
0N/A Microsoft Windows Server 2003 and 2008, and Windows XP and Vista.
0N/A list of supported systems, see the README file in the top level
0N/A of the BIND 9 source distribution.
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