We have two domain controllers DC1 & DC2 in site1 both running 2003 R2 SP2 and are DNS.DC1 holds all the FSMOs and DC2 is a global cataloge.
We are observing issues with DC2 and plan to troubleshoot it.We can not bring down the global cataloge due to its heavy usage for Exchange and Sharepoint requiring it to be highly available.
1. I add another DC,DC3 as a global catalogue till the time we troubleshoot DC2 and recommission it back.
We demote DC2 ,rebuild it and join it back and then take out DC3 from the site.
2. I add another DC,DC3 and have two global catalogues for this site.
3. I add another server with same name & IP as DC2, unplug existing DC2 and get it replicated with other DCs
Please suggest a proper approach to go in for.