Remember, the rule of thumb is one schema per forest. In terms of the schema, a multiple-forest design will have one schema per forest in the network. This means that unless you establish a form of trust between each of your forests, they will be completely different. Thus, the only way that forests in a multiple-forest architecture can communicate is by admin- istrator MCITP Certification http://www.stormcert.com intervention. From a design standpoint, this poses a couple of questions for you to consider: Who has the right to administer the separate forests? Should the administrators in one forest have access to the neigh- boring forest? These questions and many others have to be answered when you are considering your forest design. One issue is whether the forests will be autonomous or collaborative.
Thankfully, with all the features that have been enabled in Active Directory through the years, the process of modifying your schema has become a less common process. However, sometimes this process still does occur. In particular, it is exceptionally common when an administrator decides to install a software package that creates its own individual object classes, which may require an update to be spread throughout the rest of your Active Direc- tory environment.
As an example, Exchange Server 2007 creates MCTS Windows 7 Configuration http://www.stormcert.com numerous individual de?nitions before installation that must be replicated throughout the entire environment. This creates a prob- lem because if new object classes are being created, the schema is being modi?ed. If you're in a large organization with a lot of users, the process of replication can take quite a while because every machine needs to become aware of what's happening throughout the rest of the environment.
Therefore, it's best to adhere to the following steps before you alter your schema:
Plan Determine what changes are required.
Plan again Make sure you've considered all the changes that are necessary.
Test your plan Simulate your changes in a test environment.
Roll out your plan Begin the changes on a small scale when traffic is low.
By following this protocol, you can make sure the process goes as smoothly as possible.
These four steps apply to almost every aspect of server design. Plan, plan again, test your plan, and roll out your plan. At the enterprise level, you canafford to make mistakes. A single downed server can costs thousands (if not millions!) of dollars in lost productivity, transactions, or application availability. Most large organizations have specific their procedures for major upgrades and make sure the administrators follow them.
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