In our environment, we have 4 DCs (AD 2000), 2 Exchange 2000 servers and 2 DCHP/WINS 2000 servers.
All DCs are also configured to be DNS and GC (global catalogs). I called them DC1, DC2, DC3 and DC4.
My understanding is that, as long as one DC is still up and running, users can still authenticate and access their e-mail.
However, I have realized that DC1 appears to be more critical. Every time it goes down, Exchange e-mail is no longer available. And users can no longer authenticate to the network. Conversely though, if DC1 is running, and all the other DCs (DC2, DC3, and DC4) are down, we don?t seem the same adverse effect. Users can still log into the network.
My question: Is there a specific configuration to prevent that our network relies on one domain controller? We thought we were building redundancy by adding 3 additional DCs. However, that does not seem to work well.
- Sitigui Ouattara.
Windows/Exchange Network Administrator