FOMS (Schema, infrastructure master, global catalog) puzzle

  • Thread starter Thread starter Johnny Chow
  • Start date Start date
J

Johnny Chow

I read Microsoft document that they do not recommend to have infrastructure
and global catalog on the same server. Does that mean I need to setup three
DC as minimun. Two DC server are minimun because of DC failure. The first
DC server is always is Schema server. Let's say one of them is global
catalog server and other is infrasturcture server. If the global catalog DC
fail then it will not process authentication process. The workstation can
not logon to the server. Please correct me if I am wrong, I must have third
global dc server in this scenario. I will be appreciated your tips and
advice.

Thank you in advance,

Johnny Chow
 
Are you referring to this article:

http://support.microsoft.com/default.aspx/kb/197132

which contains this information?
*****
NOTE: The Infrastructure Master (IM) role should be held by a domain
controller that is not a Global Catalog server(GC). If the Infrastructure
Master runs on a Global Catalog 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 Global Catalog server holds a partial
replica of every object in the forest. As a result, cross-domain object
references in that domain will not be updated and a warning to that effect
will be logged on that DC's event log.

If all the domain controllers in a domain also host the global catalog, all
the domain controllers have the current data, and it is not important which
domain controller holds the infrastructure master role.
*****
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