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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+.. _requirements:
+
+Resource Requirements
+=====================
+
+.. _hw_req:
+
+Hardware Requirements
+---------------------
+
+DNS hardware requirements have traditionally been quite modest. For many
+installations, servers that have been retired from active duty
+have performed admirably as DNS servers.
+
+However, the DNSSEC features of BIND 9 may be quite CPU-intensive,
+so organizations that make heavy use of these features may wish
+to consider larger systems for these applications. BIND 9 is fully
+multithreaded, allowing full utilization of multiprocessor systems for
+installations that need it.
+
+.. _cpu_req:
+
+CPU Requirements
+----------------
+
+CPU requirements for BIND 9 range from i386-class machines, for serving
+static zones without caching, to enterprise-class machines
+to process many dynamic updates and DNSSEC-signed zones, serving
+many thousands of queries per second.
+
+.. _mem_req:
+
+Memory Requirements
+-------------------
+
+Server memory must be sufficient to hold both the cache and the
+zones loaded from disk. The :any:`max-cache-size` option can
+limit the amount of memory used by the cache, at the expense of reducing
+cache hit rates and causing more DNS traffic. It is still good practice
+to have enough memory to load all zone and cache data into memory;
+unfortunately, the best way to determine this for a given installation
+is to watch the name server in operation. After a few weeks, the server
+process should reach a relatively stable size where entries are expiring
+from the cache as fast as they are being inserted.
+
+.. _intensive_env:
+
+Name Server-Intensive Environment Issues
+----------------------------------------
+
+For name server-intensive environments, there are two
+configurations that may be used. The first is one where clients and any
+second-level internal name servers query the main name server, which has
+enough memory to build a large cache; this approach minimizes the
+bandwidth used by external name lookups. The second alternative is to
+set up second-level internal name servers to make queries independently.
+In this configuration, none of the individual machines need to have as
+much memory or CPU power as in the first alternative, but this has the
+disadvantage of making many more external queries, as none of the name
+servers share their cached data.
+