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Part 3: Windows Server 2003 Upgrades and Migrations
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Microsoft Windows Server 2003 Inside Out Automated Migration By creating customized scripts (using variables such as %UserName%) to collect and restore user state information, and using Remote Installation Services (RIS) with tailored answer files to automate the new operating system (OS) installation, you can completely automate the migration process. This can minimize the amount of IT labor required, yet demands a bit more planning and design. User-Driven Migration Although not the method most likely to be used in most corporate networks, having users perform the migration process by using the File and Settings Transfer Wizard can minimize IT labor and can allow the users greater discretion in the movement of their information from one computer to another.
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Preparing for Migration
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To prepare to migrate your servers or domains to Windows Server 2003, you must identify the specific users, groups, services, computers, domains, and trust relationships that are within the scope of the migration. Identify the source domain that contains the information (users, groups, etc.) from which you want to migrate, and identify the destination (target) domain to which this information will be migrated. To document the migration, enable auditing on both the source and destination domains by using either of the two following methods:
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In Windows 2000 and Windows Server 2003, start Active Directory Users and Com 9
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puters. Right-click the domain you want to work with, and select Properties. In the Group Policy tab of the Properties dialog box, select the domain policy, and then click Edit. This displays the Group Policy Object Editor. In the Group Policy Object Editor, expand Computer Configuration, Windows Settings, Security Settings, Local Policies, and then select Audit Policies. In the right pane, double-click Audit Account Management, and then select Define These Policy Settings. Under Audit These Attempts, select Success and Failure, and then click OK.
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In Windows NT, load User Manager for Domains, go to Policies, click the Audit menu
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option, enable Audit These Events, and select both Success and Failure for User And Group Management. Prior to actually performing a migration, it is useful to perform a test run to determine its effects (by viewing the logs and reports generated). To test first, select the Test The Migration Settings And Migrate Later option in each of the ADMT wizards. By doing this, you can identify errors that occur in the migration of security principals or domain information and can correct the underlying configuration factors that caused any errors before performing the actual migration. By repeating this process of doing a test run and correcting errors, you can eliminate errors in the migration.
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Part 3: Windows Server 2003 Upgrades and Migrations
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Migrating Security Principals
One of the most critical aspects of a migration is how to move security principals (such as users, groups, and computers) from one domain to another. This can get somewhat complicated in that part of the SID for each security principal is a domain SID, which of course must be changed when moved to the new domain. When you consider that the SIDs are used to regulate user access to resources on the network, migration must accomplish moving the users information to the new domain while retaining their existing access to resources. In Windows networks, user access to network resources is managed by the use of access control lists (ACLs) that specify SIDs of users and groups allowed to access the resource. For each resource (such as network shares, folders, files, printers), SIDs are applied, delineating not only which users and groups can access the resource but also the type of access that they will have, such as Read-Only permissions, Read/Write permissions, and so on. An access token, which contains not only the user s SIDs, but also the SIDs of every group to which the user belongs, is assigned to a user at the point of logon to the network. In the process of accessing a resource, the user s SIDs are compared to the SIDs assigned to the network resource. If the ACL on the network resource indicates that the user should have the type of access requested (such as Read access), the access is granted. By default, when you migrate a security principal from a source domain to the destination domain, the destination domain s SID becomes part of the user s SIDs; thus, although the user name remains the same, the underlying SID is different, reflecting the new domain to which the user is assigned. Yet, in performing a migration, part of the objective is to maintain the users existing access to network resources. To accomplish this, a history of the SIDs associated with a security principal is created (the SID history), which maintains the SIDs from the previous domain that were associated with the security principal. During network logon, in addition to the new SIDs associated with the new domain, the historic SIDs associated with the previous domain are also appended to the access token created for that user.
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