Single domain environment - Forest Function Level Win2008
Server1 - Win2k8R2 - FSMO/DC/DNS/DHCP/GC File/Print Sharing
Server2 - Win2k8Std - DC/DNS/GC File/Print Sharing
Server3 - Win2k8R2 - DC/DNS/GC (previous DHCP)
Server4 - Win2k12R2 - DC/DNS/DHCP/GC (Virtual HV - 1-Host w/ 2-Virtual Servers)
Server5 - Win2k12R2 - DC/DNS/GC File/Print Sharing
I have 3 - w2k8 Domain Controllers. Recently introduced 2 new w2k12R2 servers. The goal then is to demote and remove Server3 completely, demote Server2 and continue to use File/Sharing only.
I obviously need to move the FSMO roles to one of the W2k12 servers but I am having inconsistent performance on computers that have static IPs when I select Server5 as the Primary DNS. Could it be that because I have not moved the FSMO roles to the newest OS version that DNS and AD performance don't like the current environment? I know I have too many DCs and DNS. If I set the computers to Server1 everything is fine. I'm just hesitant to move the FSMO because it seems to be unstable or uncertain. I have run DCDIAG on all the servers and they look absolutely fine. Suggestions?