Transfer scheme master fsmo role from 2008 R2 to 2012 R2

Any issues or problems that may occur if transferring scheme master role from a 2008 R2 domain controller to a 2012 R2 domain controller?
Do all the other DCs have to be at 2012 R2 (core or gui) for it to function ok, or can I get by for a while with 2012 DC and 2008 DC mixed environment and make any any role?
garryshapeAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
Any issues or problems that may occur if transferring scheme master role from a 2008 R2 domain controller to a 2012 R2 domain controller?

only if there are communication issues with your domain controllers
dcdiag should help rule that out
otherwise should be fine

Do all the other DCs have to be at 2012 R2 (core or gui) for it to function ok, or can I get by for a while with 2012 DC and 2008 DC mixed environment and make any any role?

they will work fine
the functional level can't be raised to 2012 R2 anyway until all the 2008 domain controllers are demoted; doesn't matter if the roles are on a 2008 or 2012 domain controller

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garryshapeAuthor Commented:
I currently do have a 2012 R2 Domain Controller but it's not a FSMO.
Are you saying I need to demote the 2008 or does it do that automatically when I transfer the schema master role to the 2012 R2 target
Seth SimmonsSr. Systems AdministratorCommented:
if you wanted to raise the functional level, you can't do it until all the 2008 domain controllers are demoted (probably irrelevant to the question but just a side note)
for fsmo roles, they can go on any domain controller; a demotion of a domain controller that has any fsmo roles will automatically be moved to another domain controller
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garryshapeAuthor Commented:
Ok cool yeah it's 2008 R2 functional level right now I just wanted to transfer roles to the 2012 because the 2008 R2 is full of RSOP errors and running out of disk space
garryshapeAuthor Commented:
I was able to choose Operation Manage and transfer the Schema Master role to the 2012 DC
How do you transfer the Domain Naming Master?
netdom query fsmo shows the 2008 R2 server DC to have Domain Naming Master so I'm not sure how to transfer it to 2012.
All websites show to click in the GUI and right-click it and choose Operations Manager, but it only gives me the option of Scheme Master which is already transferred to the 2012 server..
garryshapeAuthor Commented:
Sorry found it, I was in schema, wrong mmc
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