Number of Domain Controllers
I am having a review of the system that I took over a few years back, I need to make some space on my VM servers. I am pretty sure that I have an over kill on domain controllers. We have around 800 students / 150 members of staff / around 30 visitor accounts. The domains are spilt up as the following;
1) Top Level Domain (4)
2) Child for Students (4)
3) Child for Staff (2)
The numbers next to the domain structure are the domain controllers. I am unsure why the last NM set them up in this fasion. I think I will be safe with 2 in each, I want to leave myself some redundancy.
I am looking for some firm evidence of numbers as well as friendly advice. I want to make sure I have belt and braces etc.