Entire System Struggles when Backup DC is Down
Posted on 2010-09-03
I'm trying to understand why our entire system struggles when our Backup DC is down temporarily. As soon as the DC goes down users start screaming that programs are crashing or taking forever to load/save files. Here is the setup.
Server 1 (2008 R2) - Primary DC - All FSMO, GC, DHCP, DNS, Files/Printers, databases)
Server 2 (2003 R2) - Exchange Server - Exchange only
Server 3 (2003 R2) - Backup DC - GC, DNS, WSUS, AV Server, Network Monitor
I have checked that the Primary server is the first DNS server listed in the DHCP and have edited the registry on both DC's so that Server 1 is the preferred login server for all clients. So, I'm not sure why clients are still having trouble when Server 3 is temporarily offline.
I have checked and nslookup on our local domain (domain.local) will alternate between which server is listed first, but I can't find a way in Windows DNS to control that.
Any thoughts or suggestions?
Thanks in advance.