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Login to secondary Domain controller if primary one goes down

Posted on 2014-09-22
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Last Modified: 2014-09-28
We recently build secondary Domain controller (DC2) and replication between PDC (DC1) and DC2 is working fine. We want to shutdown PDC (DC1) in order to migrate to another host. Question is will DC2 automatically take over logon services? DNS,AD roles are on DC2. They both are running on same OS (2008 R2).
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Question by:ArcIT
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by:Cliff Galiher
ID: 40338399
If you made it a GC then it should.
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by:Sekar Chinnakannu
Sekar Chinnakannu earned 166 total points
ID: 40338404
Yes DC2 automatically take the logon services, Users who are connected to DC1 will face the timeout issue for few mins, but after sometime they able to connect to DC2 automatically.
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by:ArcIT
ID: 40338406
Is their anyway without rebooting to DC1, i can force my machine to logon to DC2? for testing purposes? Also netlogon and Sysvol is not appearing on DC2 as well.
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by:Cliff Galiher
Cliff Galiher earned 167 total points
ID: 40338431
active directory is multimaster, so you don't "force" anything. It just works. Timeouts only occur if something is misconfigured.

Missing sysvol is a bigger issue. That usually means that replication is broken and you need to troubleshoot the health of AD. Dcdiag is the usual tool of choice.
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by:Sekar Chinnakannu
ID: 40338459
For testing you can give a try in your lab\staging environment. You just create AD site and associate with the subnet, client can reach the dc based on their site configuration.
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by:ArcIT
ID: 40338466
I will leave this case opens until i findout more about this sysvol and netlogon not replicating. I think that the biggest issue we need to sort out before migration.
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DrDave242 earned 167 total points
ID: 40339116
A couple of questions:

Do the SYSVOL and NETLOGON shares show up correctly on DC1?
Is SYSVOL replicated using File Replication Service (FRS) or Distributed File System Replication (DFSR) in your environment?
The first thing I'd do is check the corresponding event log (FRS or DFSR) on DC2  for errors.
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by:ArcIT
ID: 40340619
We use DFS in our organisation but as we just created secondary DC, we thought some sort of inbuilt replication in DC would be replicating those folders to secondary.
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by:Cliff Galiher
ID: 40340623
It does, but the "inbuilt" replication is either FRS or DFS-R, depending on how old the environment is and if I.T. ever chose to upgrade from FRS at any time in the past. The added DC will simply look at the existing environment and use the replication engine already in place.
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