How to migrate from 2008 R2 AD DC to 2012 R2

I have a new server 2012 R2 box and i need to add it to an existing 2008 R2 domain; However, I will be migrating the old 2008 ADDC DNS to the 2012 box.  The 2008 box is an SQL server  and also hosts a Medical software. This 08 server is also acting as a NAS and print server.  What is the best way to migrate to the 2012 server and retire the 08 box?
Daniel TidwellIT TechAsked:
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Cliff GaliherCommented:
Take this opportunity to break apart those roles. At least SQL and LOB apps off the domain controller. Move those first. Move ADDS last. Do one role at a time.
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Daniel TidwellIT TechAuthor Commented:
Im having trouble with the 2012 server seeing the 2008 server.  This is the error im getting "verification of replica failed. An active directory domain controller for the domain " " could not be contacted.  Ensure that you supplied the correct DNS domain name."  I have googled the error and have not had much success.
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Cliff GaliherCommented:
Sounds like your existing 2008 DC is unhealthy. You can't do anything new until you fix existing problems. Event logs and dcdiag are the tools of trade in that facet.
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Daniel TidwellIT TechAuthor Commented:
The thin is, I can join the domain so I know it compnicates, I just dont get why it cant migrate the rolls
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Cliff GaliherCommented:
There are a lot of things you can do even when domain controllers are unhealthy. But other things are blocked. You NEED to address those errors. Attempting to migrate beforehand can make things worse. Unrecoverable even.
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Daniel TidwellIT TechAuthor Commented:
I did find an DNS issue Error ID: 4515.  Im looking into this. Ill let you know. Thanx
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Is there a reason you haven't run DCDIAG /C /E /V on the existing DC?  

And I completely agree with Cliff - you need to leverage virtualization on the new server and setup a VM for SQL and another for the DC.
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Windows Server 2012

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