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f78b12e570284aa8291f4ca1add24937fd107403vboxsync - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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f78b12e570284aa8291f4ca1add24937fd107403vboxsync<title>Chapter�2.�BIND Resource Requirements</title>
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f78b12e570284aa8291f4ca1add24937fd107403vboxsync<link rel="prev" href="Bv9ARM.ch01.html" title="Chapter�1.�Introduction">
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f78b12e570284aa8291f4ca1add24937fd107403vboxsync<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<tr><th colspan="3" align="center">Chapter�2.�<acronym class="acronym">BIND</acronym> Resource Requirements</th></tr>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<a accesskey="p" href="Bv9ARM.ch01.html">Prev</a>�</td>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<td width="20%" align="right">�<a accesskey="n" href="Bv9ARM.ch03.html">Next</a>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<a name="Bv9ARM.ch02"></a>Chapter�2.�<acronym class="acronym">BIND</acronym> Resource Requirements</h2></div></div></div>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567618">Hardware requirements</a></span></dt>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567644">CPU Requirements</a></span></dt>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567657">Memory Requirements</a></span></dt>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567684">Name Server Intensive Environment Issues</a></span></dt>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<dt><span class="sect1"><a href="Bv9ARM.ch02.html#id2567694">Supported Operating Systems</a></span></dt>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<div class="titlepage"><div><div><h2 class="title" style="clear: both">
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<a name="id2567618"></a>Hardware requirements</h2></div></div></div>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync <acronym class="acronym">DNS</acronym> hardware requirements have
f78b12e570284aa8291f4ca1add24937fd107403vboxsync traditionally been quite modest.
f78b12e570284aa8291f4ca1add24937fd107403vboxsync For many installations, servers that have been pensioned off from
f78b12e570284aa8291f4ca1add24937fd107403vboxsync active duty have performed admirably as <acronym class="acronym">DNS</acronym> servers.
f78b12e570284aa8291f4ca1add24937fd107403vboxsync The DNSSEC features of <acronym class="acronym">BIND</acronym> 9
f78b12e570284aa8291f4ca1add24937fd107403vboxsync may prove to be quite
f78b12e570284aa8291f4ca1add24937fd107403vboxsync CPU intensive however, so organizations that make heavy use of these
f78b12e570284aa8291f4ca1add24937fd107403vboxsync features may wish to consider larger systems for these applications.
f78b12e570284aa8291f4ca1add24937fd107403vboxsync <acronym class="acronym">BIND</acronym> 9 is fully multithreaded, allowing
f78b12e570284aa8291f4ca1add24937fd107403vboxsync full utilization of
f78b12e570284aa8291f4ca1add24937fd107403vboxsync multiprocessor systems for installations that need it.
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<div class="titlepage"><div><div><h2 class="title" style="clear: both">
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<a name="id2567644"></a>CPU Requirements</h2></div></div></div>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync CPU requirements for <acronym class="acronym">BIND</acronym> 9 range from
f78b12e570284aa8291f4ca1add24937fd107403vboxsync i486-class machines
f78b12e570284aa8291f4ca1add24937fd107403vboxsync for serving of static zones without caching, to enterprise-class
f78b12e570284aa8291f4ca1add24937fd107403vboxsync machines if you intend to process many dynamic updates and DNSSEC
f78b12e570284aa8291f4ca1add24937fd107403vboxsync signed zones, serving many thousands of queries per second.
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<div class="titlepage"><div><div><h2 class="title" style="clear: both">
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<a name="id2567657"></a>Memory Requirements</h2></div></div></div>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync The memory of the server has to be large enough to fit the
f78b12e570284aa8291f4ca1add24937fd107403vboxsync cache and zones loaded off disk. The <span><strong class="command">max-cache-size</strong></span>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync option can be used to limit the amount of memory used by the cache,
f78b12e570284aa8291f4ca1add24937fd107403vboxsync at the expense of reducing cache hit rates and causing more <acronym class="acronym">DNS</acronym>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync Additionally, if additional section caching
f78b12e570284aa8291f4ca1add24937fd107403vboxsync (<a href="Bv9ARM.ch06.html#acache" title="Additional Section Caching">the section called “Additional Section Caching”</a>) is enabled,
f78b12e570284aa8291f4ca1add24937fd107403vboxsync the <span><strong class="command">max-acache-size</strong></span> can be used to
f78b12e570284aa8291f4ca1add24937fd107403vboxsync limit the amount
f78b12e570284aa8291f4ca1add24937fd107403vboxsync of memory used by the mechanism.
f78b12e570284aa8291f4ca1add24937fd107403vboxsync It is still good practice to have enough memory to load
f78b12e570284aa8291f4ca1add24937fd107403vboxsync all zone and cache data into memory — unfortunately, the best
f78b12e570284aa8291f4ca1add24937fd107403vboxsync to determine this for a given installation is to watch the name server
f78b12e570284aa8291f4ca1add24937fd107403vboxsync in operation. After a few weeks the server process should reach
f78b12e570284aa8291f4ca1add24937fd107403vboxsync a relatively stable size where entries are expiring from the cache as
f78b12e570284aa8291f4ca1add24937fd107403vboxsync fast as they are being inserted.
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<div class="titlepage"><div><div><h2 class="title" style="clear: both">
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<a name="id2567684"></a>Name Server Intensive Environment Issues</h2></div></div></div>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync For name server intensive environments, there are two alternative
f78b12e570284aa8291f4ca1add24937fd107403vboxsync configurations that may be used. The first is where clients and
f78b12e570284aa8291f4ca1add24937fd107403vboxsync any second-level internal name servers query a main name server, which
f78b12e570284aa8291f4ca1add24937fd107403vboxsync has enough memory to build a large cache. This approach minimizes
f78b12e570284aa8291f4ca1add24937fd107403vboxsync the bandwidth used by external name lookups. The second alternative
f78b12e570284aa8291f4ca1add24937fd107403vboxsync is to set up second-level internal name servers to make queries
f78b12e570284aa8291f4ca1add24937fd107403vboxsync independently.
f78b12e570284aa8291f4ca1add24937fd107403vboxsync In this configuration, none of the individual machines needs to
f78b12e570284aa8291f4ca1add24937fd107403vboxsync have as much memory or CPU power as in the first alternative, but
f78b12e570284aa8291f4ca1add24937fd107403vboxsync this has the disadvantage of making many more external queries,
f78b12e570284aa8291f4ca1add24937fd107403vboxsync as none of the name servers share their cached data.
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<div class="titlepage"><div><div><h2 class="title" style="clear: both">
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<a name="id2567694"></a>Supported Operating Systems</h2></div></div></div>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync ISC <acronym class="acronym">BIND</acronym> 9 compiles and runs on a large
f78b12e570284aa8291f4ca1add24937fd107403vboxsync of Unix-like operating system and on NT-derived versions of
f78b12e570284aa8291f4ca1add24937fd107403vboxsync Microsoft Windows such as Windows 2000 and Windows XP. For an
f78b12e570284aa8291f4ca1add24937fd107403vboxsync list of supported systems, see the README file in the top level
f78b12e570284aa8291f4ca1add24937fd107403vboxsync of the BIND 9 source distribution.
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<a accesskey="p" href="Bv9ARM.ch01.html">Prev</a>�</td>
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f78b12e570284aa8291f4ca1add24937fd107403vboxsync<td width="40%" align="left" valign="top">Chapter�1.�Introduction�</td>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<td width="20%" align="center"><a accesskey="h" href="Bv9ARM.html">Home</a></td>
f78b12e570284aa8291f4ca1add24937fd107403vboxsync<td width="40%" align="right" valign="top">�Chapter�3.�Name Server Configuration</td>