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Applies To: Windows Server 2008, Windows Server 2008 R2
When you plan your Domain Name System (DNS) servers, it is important to do the following: Perform capacity planning, and review server hardware requirements.
Determine how many DNS servers you need and their role in your network.
When you consider the number of DNS servers to use, decide which servers will host primary and secondary copies of zones. Also, if you are using Active Directory Domain Services (AD DS), determine whether the server computer will perform as a domain controller or as a member server in the domain.
Decide where you are going to place DNS servers on your network for traffic loads, replication, and fault tolerance.
Decide if you are using only DNS servers running Windows Server 2008 for all your DNS servers or if you are operating a mixture of DNS server implementations.
Server capacity planning
Planning and deploying DNS servers on your network involves examining several aspects of your network and the capacity requirements for any DNS servers that you intend to use in it. Some questions to consider when you are planning DNS server capacity include the following: How many zones is the DNS server expected to load and host?
For each zone that the server is loading for service, how large is the zone (based on the size of the zone file or the number of resource records used in the zone)?
For a multihomed DNS server, how many interfaces are to be enabled for listening to and servicing DNS clients on each of the server's connected subnets?
How many total or overall DNS query requests from all of its clients is a DNS server expected to receive and service?
In many cases, adding more RAM to a DNS server can provide the most noticeable improvements in performance. This is because the DNS Server service fully loads all of its configured zones into memory at startup. If your server is operating...