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The <span><strong class="command">max-cache-size</strong></span> 91 option can be used to limit the amount of memory used by the cache, 92 at the expense of reducing cache hit rates and causing more <acronym class="acronym">DNS</acronym> 93 traffic. 94 Additionally, if additional section caching 95 (<a href="Bv9ARM.ch06.html#acache" title="Additional Section Caching">the section called “Additional Section Caching”</a>) is enabled, 96 the <span><strong class="command">max-acache-size</strong></span> option can be used to 97 limit the amount 98 of memory used by the mechanism. 99 It is still good practice to have enough memory to load 100 all zone and cache data into memory — unfortunately, the best 101 way 102 to determine this for a given installation is to watch the name server 103 in operation. After a few weeks the server process should reach 104 a relatively stable size where entries are expiring from the cache as 105 fast as they are being inserted. 106 </p> 107</div> 108<div class="sect1" lang="en"> 109<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 110<a name="id2567819"></a>Name Server Intensive Environment Issues</h2></div></div></div> 111<p> 112 For name server intensive environments, there are two alternative 113 configurations that may be used. The first is where clients and 114 any second-level internal name servers query a main name server, which 115 has enough memory to build a large cache. This approach minimizes 116 the bandwidth used by external name lookups. The second alternative 117 is to set up second-level internal name servers to make queries 118 independently. 119 In this configuration, none of the individual machines needs to 120 have as much memory or CPU power as in the first alternative, but 121 this has the disadvantage of making many more external queries, 122 as none of the name servers share their cached data. 123 </p> 124</div> 125<div class="sect1" lang="en"> 126<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 127<a name="id2567830"></a>Supported Operating Systems</h2></div></div></div> 128<p> 129 ISC <acronym class="acronym">BIND</acronym> 9 compiles and runs on a large 130 number 131 of Unix-like operating systems and on 132 Microsoft Windows Server 2003 and 2008, and Windows XP and Vista. 133 For an up-to-date 134 list of supported systems, see the README file in the top level 135 directory 136 of the BIND 9 source distribution. 137 </p> 138</div> 139</div> 140<div class="navfooter"> 141<hr> 142<table width="100%" summary="Navigation footer"> 143<tr> 144<td width="40%" align="left"> 145<a accesskey="p" href="Bv9ARM.ch01.html">Prev</a>�</td> 146<td width="20%" align="center">�</td> 147<td width="40%" align="right">�<a accesskey="n" href="Bv9ARM.ch03.html">Next</a> 148</td> 149</tr> 150<tr> 151<td width="40%" align="left" valign="top">Chapter�1.�Introduction�</td> 152<td width="20%" align="center"><a accesskey="h" href="Bv9ARM.html">Home</a></td> 153<td width="40%" align="right" valign="top">�Chapter�3.�Name Server Configuration</td> 154</tr> 155</table> 156</div> 157<p style="text-align: center;">BIND 9.10.2-P4</p> 158</body> 159</html> 160