How to add a new domain controller to an existing Active Directory domain?
The specific situation is as follows: The company has one forest and domain, and two Active Directory (AD) servers. These two servers communicate and synchronize data. One server is deployed in the local data center, and the other is deployed on Azure Cloud. The forest and domain functional levels are both Windows Server 2008 R2. Both servers are running Windows Server 2016 Standard. Because there are computers running Windows XP and Windows 7 in the domain, upgrading the forest and domain functional levels is not possible. Windows Server 2008 R2 must be retained. The company now needs to add a new AD server on Huawei Cloud and join it to the company's forest and domain. The main questions are: How do I determine which operating system the new server should run? Excluding Windows Server 2016. How should I choose between Windows Server 2019, 2022, and 2025? How do I determine how to allocate CPU, memory, disk, and network resources during system deployment? How to determine which operating system is best suited for running a domain controller without conflicts or incompatibility? What preparations should be made before deploying a new server?