RE: Merging Dissimilar Domains

  • From: "constanv" <constanv@xxxxxxxxxx>
  • To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Tue, 26 Feb 2002 08:51:41 -0500

First a question: Are all your Exchange servers in the same Org? If they
are then you can use Move Server. Another thing to remember is that
Exchange has its own directory and changing of the user NT domains will
affect the acoount in Exchange. You must plan this.

-----Original Message-----
From: Beahm, Keith [mailto:kbeahm@xxxxxxxxxxx] 
Sent: Monday, February 25, 2002 7:28 PM
To: [ExchangeList]
Subject: [exchangelist] Merging Dissimilar Domains

We have a situation in which we will have to merge (as quickly as
possible) 5 separate domains into a 6th one.  The 5 domains are already
physically connected, but the 6th domain (the one they all have to join)
cannot be physically connected more than 1 or 2 weeks before they are
all expected to be functioning as one.  We have discussed four methods -
(1) establishing full 2-way trust and migrating the domains at a more
relaxed pace over an extended time period.  (2) rebuilding the 5 PDC's,
rejoining all the member servers and manually importing all the users to
the 6th domain.  (3) Using tools such as U-Promote or Newsid to modify
the SID's of the existing member and DC's in effect forcing them to
become members of the 6th domain.  (4) hold on cause this one's a little
complicated - build a PDC in the 6th domain (this gives it the right SID
stock, and all of the existing 6th domain user and server accounts) and
ship it off to the other site with the 5 physically connected domains.
Then they begin joining the 6th domain ahead of schedule, and on the day
of reckoning we unplug the 6th domain PDC (don't want any PDC wars).
Then once physically connected the remote PDC should serve all 6
domains, and all the 6th domain admins have to do is re-enter all
changes made to server and user accounts since the separation.

There are Exchange and SQL servers in each of the 6 domains.  The "6th
domain" has several SQL and Exchange servers each.  In the 6th domain
all of the Exchange servers are in the same site. Exchange we had
planned to tackle using the Move Server Wizard.  SQL we will have to
rerun the installation, but the DB's should all remain intact.

Your thoughts or suggestions would be greatly appreciated on the topic
of domain merges, and/or the handling of SQL and Exchange in this

Keith Beahm, Network Engineer 

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