UCS Manual for creating backup/secondary domain controller

Hi,

I am planning to install UCS for backup/secondary domain controller.
I finished installed UCS and all the data from Primary DC (Win 2K12) has copied to UCS.
However, when I unplugged the UCS and client from Primary DC, the client unable to login via UCS. Please help if there is any setting that I have to adjust in Primary DC?

If you have the manual from beginning to end, I appreciate it. Thank you

Using Windows-based and Samba-based AD DCs in the same domain is not supported, mostly due to there being no cross-platform mechanism for synchronizing the sysvol & netlogon shares.

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