In most cases an administrator can keep the FSMO role holders (all 5 of them) in the same spot (or actually, on the same DC)
as has been configured by the Active Directory installation process. However, there are scenarios where an administrator would want to move one or more of the FSMO roles from the default holder DC to a different DC.
Moving the FSMO roles while both the original FSMO role holder and the future FSMO role holder are online and operational is called Transferring, and is described in the Transferring FSMO Roles article.
However, when the original FSMO role holder went offline or became non operational for a long period of time, the administrator might consider moving the FSMO role from the original, non-operational holder, to a different DC. The process of moving the FSMO role from a non-operational role holder to a different DC is called Seizing, and is described in this article.
If a DC holding a FSMO role fails, the best thing to do is to try and get the server online again. Since none of the FSMO roles are immediately critical (well, almost none, the loss of the PDC Emulator FSMO role might become a problem unless you fix it in a reasonable amount of time), so it is not a problem to them to be unavailable for hours or even days.
If a DC becomes unreliable, try to get it back on line, and transfer the FSMO roles to a reliable computer. Administrators should use extreme caution in seizing FSMO roles. This operation, in most cases, should be performed only if the original FSMO role owner will not be brought back into the environment. Only seize a FSMO role if absolutely necessary when the original role holder is not connected to the network.
The following table summarizes the FSMO seizing restrictions:
Original must be reinstalled
Can transfer back to original
Another consideration before performing the seize operation is the administrator's group membership, as this table lists:
Administrator must be a member of
To seize the FSMO roles by using Ntdsutil, follow these steps:
On any domain controller, click Start, click Run, type Ntdsutil in the Open box, and then click OK.
Microsoft Windows [Version 5.2.3790]
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Type roles, and then press ENTER.
Note: To see a list of available commands at any of the prompts in the Ntdsutil tool, type ?, and then press ENTER.
Type connections, and then press ENTER.
fsmo maintenance: connections
Type connect to server <servername>, where <servername> is the name of the server you want to use, and then press ENTER.
server connections: connect to server server1
Binding to server1 ...
Connected to server1 using credentials of locally logged on user.
At the server connections: prompt, type q, and then press ENTER again.
server connections: qfsmo maintenance:
Type seize <role>, where <role> is the role you want to seize. For example, to seize the RID Master role, you would type seize rid master:
Seize domain naming master
Seize infrastructure master
Seize RID master
Seize schema master
You will receive a warning window asking if you want to perform the seize. Click on Yes.
fsmo maintenance: Seize infrastructure master
Attempting safe transfer of infrastructure FSMO before seizure.ldap_modify_sW error 0x34(52 (Unavailable).
Ldap extended error message is 000020AF: SvcErr: DSID-03210300, problem 5002 (UNAVAILABLE)
, data 1722
Win32 error returned is 0x20af(The requested FSMO operation failed. The current FSMO holde
r could not be contacted.)
Depending on the error code this may indicate a connection,ldap, or role transfer error.
Transfer of infrastructure FSMO failed, proceeding with seizure ...
Server "server1" knows about 5 roles
Note: All five roles need to be in the forest. If the first domain controller is out of the forest then seize all roles. Determine which roles are to be on which remaining domain controllers so that all five roles are not on only one server.
Repeat steps 6 and 7 until you've seized all the required FSMO roles.
After you seize or transfer the roles, type q, and then press ENTER until you quit the Ntdsutil tool.
Note: Do not put the Infrastructure Master (IM) role on the same domain controller as the Global Catalog server. If the Infrastructure Master runs on a GC server it will stop updating object information because it does not contain any references to objects that it does not hold. This is because a GC server holds a partial replica of every object in the forest.