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Requirements for the Pilot site to be used for 1st pilot site migration

Posted on 2014-12-23
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Last Modified: 2014-12-24
Hello,
 I would like to ask for some bullet points - what do you think would be the requirements for the first pilot site?  it is a simple DC upgrade migration where DCs are upgraded from 2k3 to 2012. Most sites have from 1DC to 4 DCs. I was asked for a document with the requirements for the pilot site so that they can make a determination what would be a good candidate.


Thank you!
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Question by:creative555
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by:Joseph Daly
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Have you already prepped the domain for 2012 r2? The prep needs to be completed on specific masters depending on wether it is a domain prep or a forest prep.

Once the forest/domain has been prepped it doesnt really matter which site you actually start on. I would definitely suggest starting on a site with at least 2 domain controllers and a good network connection and if possible a site where none of the domain controller hold any of the FSMO roles.

Are the servers you are upgragind physical or virtual? If they are physical and you are reusing them you should have a fallback DC on site while you take down, rebuild and promote the new server.

If they are VMs then it should be easy enough to spin up a new 2012 DC promote it and add it to that site then demote the 2003 servers.
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by:creative555
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Thank you for the quick reaponse!
We have all virtual servers running on VMWare and we will not be reusing old hardware. Is there a reason why the pilot site should not have dc that holds fsmo?  We have not extended our schema for 2012 yet,  but once it is done on fsmo master, then the entire forest gets affected....do you advise running 2012 domain prep for one domain at a time or doesn't matter?  So there is nothing else as far as requirements go? How about number of users and type of users? We have many sites with different numbers of users, pcs. Thank you again
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Joseph Daly earned 500 total points
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If you have multiple domains in your forest you will need to run forest prep once and then domain prep on each domain. Check the "Running ADprep.exe" section of this document for what must be ran, where, and how many times.

http://technet.microsoft.com/en-us/library/dd464018(v=ws.10).aspx

Once you have your prep done this is actually pretty simple. The high level steps for one of your sites would be something similar to below.

1. Create new 2012 R2 VM
2. Add Dns role and promote to DC
3. Let it replicate and make sure everythign works.
4. At this point you should have at least one 2003 and the new 2012 DC in place replicating.
5. Change client and non-dc servers DNS to point to new 2012 server and make sure that works.
6. Once you are sure DNS, AD, everything else is working you can either bring on additional 2012 DCs the same way or
7. Once all your 2012 DCs are up functions and everything moved off the 2003 DCs you can demote the old DCS.
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by:creative555
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That is also very helpful. So, for the Pilot Site requirements, I got the following so far:

•      At least two Windows 2012 R2 Servers
•      Good network connection
•      Site where none of the domain controller holds any of the FSMO roles.

And the purpose would be:

Adding 2012 Servers to the domain
Promoting Windows 2012 R2 to Domain Controllers
Migrating DNS, DHCP, and WINS from Windows 2003 Servers to Windows 2012 R2 Servers
Verifying the replication
Updating clients and non-DC servers DNS to point to the new 2012 server
Verifying that DNS, AD are functioning and clients are working with 2012 server with no issues.

Is there anything else do you think it is required for the first test site?
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by:Joseph Daly
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I think that should cover the majority of the work but every site can be a ltitle different. I would make sure to spend some time looking around to make sure that nothing else is living on the 2003 servers.

One possiblity I could easily see would be DHCP being on one of the old boxes. If that is the case you would probably need to migrate that off to a 2012 box, or if you wanted to get fancy use the highly available DHCP option in 2012.

The big thing to keep in mind is that you will always want at least one DC running at the site to authenticate users and provide DNS resolution. They can live without a DC but then their authentication and DNS would need to hit a DC offsite and could cause slowness or performance issues.
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by:creative555
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Excellent! I think this is everything I need now. Thank you very much Joseph!
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