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Under most circumstances, you should not need to perform an offline defragmentation. Make sure you study your situation and need carefully before performing this action.
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A final maintenance issue I want to mention is ghost objects, also called phantom objects. Ghost objects are actually errors that occur within the database and occur when an object has been deleted, but some kind of error has prevented the object from actually being removed. You end up with a ghost object that appears in the directory although the object is not actually available. The same problem can possibly occur when you remove a domain. When the last domain controller is removed, you should select the this is the last domain controller in the domain
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12 Maintaining the Active Directory
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check box. If you do not, the domain still appears in the Active Directory even though it does not actually exist. Fortunately, ghost objects or domains can be easily removed. For objects, take note of the full object path, such as cn=object, cn=OU, dc=domain, dc=com and then boot the server into Directory Services Repair Mode. Run NTDSUTIL, type Files, and enter the full path of the object. Then run a header and integrity check in order to remove the ghost. In the case of a ghosted domain, use NTDSUTIL and follow these steps: 1. Type metadata cleanup and press Enter. 2. Type connections and press Enter. 3. Type connect to server domainnamingmasterserver and press Enter. 4. Type quit and press Enter. 5. Type select operation target and press Enter. 6. Type list domains and press Enter. 7. Type select domain number, where number is the number of the domain, and press Enter. 8. Type quit and press Enter. 9. Type remove selected domain and press Enter.
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This chapter explored a number of Active Directory maintenance issues. First, you can back up the Active Directory database on a domain controller using Windows Backup. In order to back up the Active Directory database, you choose to back up System State Data. In the case of a failure, the database can be recovered by booting the server into Directory Services Repair Mode and then using Windows Backup to restore the database. In some cases, you may need to perform an authoritative restore, which marks an entire database or certain objects as authoritative for replication purposes. This process is performed using NTDSUTIL and before you reboot the server. You can also use the Windows 2000 Recovery Console, which can be installed or run from the installation CD-ROM to perform a number of administrative tasks. Finally, you can maintain the Active Directory by checking the LostAndFound container, using manual defragmentation (if necessary), and removing ghost objects as needed. Overall, Active Directory maintenance is quite easy for administrators because the Active Directory takes care of most of its maintenance needs.
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Managing Active Directory Replication
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s a technical instructor, I always hated to teach the topic of replication in the NT world. It was difficult, confusing, and often just irritating to students. Replication in Windows 2000 for intrasite and intersite Active Directory traffic is certainly no picnic either, but there have been a number of changes to the process that make replication more effective and certainly more hands-off for Active Directory administrators. Unfortunately, the process is still quite complex, and the information from Microsoft about managing intersite traffic is hazy at best. In this chapter, I am going to explore how replication works in a Windows 2000 network. Then I ll explore some practical solutions for managing replication traffic between your Active Directory sites.
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Exploring Active Directory replication Managing intrasite replication Examining intersite replication Using Replication Monitor
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In terms of the Active Directory, replication can be examined in two major categories intrasite and intersite. Intrasite replication is replication that occurs within an Active Directory site. Intersite replication is replication that occurs between different Active Directory sites. Before jumping into the details of replication, I first want to review Active Directory s replication model. Replication is the process of synchronizing data on several computers. The purpose of replication is to ensure that each computer has the same data in other words, to ensure that a change in data made on one computer is copied to all of the other computers to ensure data integrity. The Active Directory functions by using multimaster replication. Multimaster replication means that there is no single master replicator computer in the environment, but all domain controllers are responsible for initiating and participating in
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