In order to proceed with the migration forest function level should set to windows server 2008 or later. So in case your organisation not performed this yet, the first step is to get the forest and domain functional level up to date.
You can confirm if the system makes use of the FRS using dfsrmig /getglobalstate , To do that:
1) Log in to domain controller as Domain admin or Enterprise Admin
2) Launch PowerShell console and type dfsrmig /getglobalstate. Output explains it’s not initiated DFRS migration but.
Before moving into the configurations we’ll have to look into levels of the migration.
There are 4 stable states going together with the 4 migration phases.
1) State 0 – Start
2) State 1 – Prepared
3) State 2 – Redirected
4) State 3 – Eliminated
State 0 – Start
With initiating this state, FRS will replicate SYSVOL folder among the many domain controllers. It is very important to have an updated copy of SYSVOL before begins the migration process to keep away from any conflicts.
State 1 – Prepared
On this state, while FRS continues replicating SYSVOL folder, DFSR will replicate a replica of SYSVOL folder. It will likely be positioned in %SystemRoot%\SYSVOL_DFRS by default. However, this SYSVOL won’t respond to some other domain controller service requests.
State 2 – Redirected
In this state, the DFSR copy of SYSVOL begins to respond to SYSVOL service requests. FRS will proceed with the replication of its own SYSVOL copy, however, it won’t be involved with the SYSVOL replication.
State 3 – Eliminated
In this state, DFS Replication will continue its replication and servicing SYSVOL requests. Windows will delete original SYSVOL folder users by FRS replication and cease the FRS replication.
In order to migrate from FRS to DFSR its must to go from State 1 to State 3. This step can’t be reversed.
Migration Steps:
Prepared State
1. Log in to domain controller as Domain admin or Enterprise Admin
2. Launch PowerShell console
3. Type dfsrmig /setglobalstate 1 and press enter
4. Type dfsrmig /getmigrationstate to verify all domain controllers have reached a prepared state
Redirected State
1. Log in to domain controller as Domain admin or Enterprise Admin
2. Launch PowerShell console
3. Type dfsrmig /setglobalstate 2 and press enter
4. Type dfsrmig /getmigrationstate to verify all domain controllers have reached redirected state
Eliminated State
1. Log in to domain controller as Domain admin or Enterprise Admin
2. Launch PowerShell console
3. Type dfsrmig /setglobalstate 3 and press enter
4. Type dfsrmig /getmigrationstate to verify all domain controllers have reached eliminated state
This completes the migration process and to verify the SYSVOL share, type net share command and enter.
Additionally, be certain in each domain controller FRS service is stopped and disabled. This could occur automatically, however, please confirm.