Jorge's Quest For Knowledge!

All about Windows Server, ADDS, ADFS & FIM (It Is Just Like An Addiction, The More You Have, The More You Want To Have!)

(2006-07-18) The Infrastructure Master FSMO And The GC Role

Posted by Jorge on 2006-07-18


This is so simple and people still ask questions in the newsgroups about it. It has been answered sooooooooo many times it almost hurts typing this over and over again….

Concerning the Infrastructure Master FSMO role and the GC role look at it from the domain perspective. If all DCs in a certain domain are GC then it does not matter if the Infrastructure Master FSMO of that domain is on a GC. You don’t have any other choice though. If you have at least one OTHER DC (besides the Infrastructure Master FSMO itself) in that same domain that is/will NOT be a GC then do not put the Infrastructure Master FSMO of that same domain on a GC.

For more info on this read: MS-KBQ248047_Phantoms, Tombstones and the Infrastructure Master.


Short and sweet rule of thumb:
No matter what forest structure is, the following rules apply for EACH AD domain in the AD forest
(1) If all DCs in an AD domain are GC, there is no other choice where to put the Infrastructure Master FSMO. So no issue here! (TIP: In Single domain AD forest make every DC a GC!)
(2) If at least one or more other DCs in an AD domain (besides the Infrastructure Master FSMO itself) are not a GC, then the Infrastructure Master FSMO should NOT be on a GC. (If the Infrastructure Master FSMO is the ONLY DC within the domain that is not a GC, make it a GC as there is no other DC that is not a GC!)

Cheers,
Jorge
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One Response to “(2006-07-18) The Infrastructure Master FSMO And The GC Role”

  1. [...] IM is also used for intra-forest migrations of objects (I need to blog about this!). Also see "The Infrastructure Master FSMO And The GC Role" and "Phantoms, tombstones and the infrastructure master". Remember that when the [...]

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