Hp web site - Part 3: Windows Server 2003 Upgrades and Migrations
Part 3: Windows Server 2003 Upgrades and Migrations Preparing for Upgrades and Migration Preparing for an Upgrade from Windows NT 4 to Windows Server 2003 Upgrading from a Windows NT 4 networking environment requires a substantial amount of assessment and planning. The move from a network environment employing Windows NT domains to a network based upon Active Directory is a major change, and one with far- reaching implications. In addition to the technical aspects of shifting from a NetBIOS-based network to one centered on DNS and LDAP, there are administrative issues for IT management, and the business side of the company is sure to have opinions concerning information management. Although Active Directory might be the most significant change from Windows NT to Windows Server 2003, it is by no means the only one. Many additional services (particularly Internet-related ones) have been added when Windows NT shipped, after all, the Internet was but a small blip on Microsoft Corporation radar. Namespace in Windows NT vs. Active Directory Each Windows NT 4 domain is a single flat namespace with no internal or external hierarchy, while Active Directory domains exist within a DNS tree where each domain can map to a domain within the Active Directory tree. A single Windows NT domain can contain users and a few types of resources (such as file servers), and on many small networks, they do. There are significant limits on the number of objects per Windows NT domain the theoretical limit is 40,000, yet few servers running Windows NT perform well when approaching that limit. Accordingly, many Windows NT 4 networks employ multiple domains linked by trust relationships that are manually configured (sometimes laboriously so) to allow user authentication and access to resources. Active Directory transcends these Windows NT limitations: a single Active Directory domain can hold millions of users, servers, computers, and many additional kinds of objects representing a major shift in network management. By providing effectively limitless domains and automatic trusts, Active Directory offers domain structures based on IT functionality, not product limitations. Moving from Windows NT Domains to Active Directory You have to move your existing domain structure from one to the other from multiple independent domains linked by explicit trust relationships to a single tree with a domain hierarchy, wherein all domains automatically trust each other. This is a big change, and it is a good idea to take a step back from your existing domain design when considering what your Active Directory domain tree will look like. Domain design is different in Windows Server 2003; remember, the most common reason for adding an Chapter 7
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