AD Schema update

I have 4 windows 2003 standard SP2 DCs across site. Primary site of DC1 =Schema Master , Infrastructure Master, DC2= Domain Naming Master, PDC , RDC role holder. I have other 2 GC across two different site. I want to add first 2008 R2 DC into my forest. How to upgrade schema ?

One more thing, if there is a problem after updating schema, other DC can not replicate due to schema mismatch, how to troubleshoot? One of my friend also did this kind of upgrade, after upgrade ,other DC can not replicate due to schema mismatch.

Please advise.

Zaw Tun Naing
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