dcdiag /TEST:DNS /v >> c:\temp\step1_dns.txt
netsh dhcp show server >> c:\temp\step2_dhcp.txt
dcdiag /a /v /c >> c:\temp\step3_dc.txt
repadmin /showrepl >> c:\temp\step4_replica.txt
repadmin /replsummary >> c:\temp\step5_replica_sum.txt
repadmin /replsum /errorsonly >> c:\temp\step6_replica_err.txt
repadmin /options * >> c:\temp\step7_replica_opt.txt
If you want to verify Schema Version on DC you must to on register:
Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\NTDS\Parameters
REG_WORD Schema Version and you will find relative number
If you like to upgrade schema before installing new Windows 2012 R2 domain controller you can utilize this article:
http://nolabnoparty.com/migrare-active-directory-a-windows-2012-r2-pt-1/
<------------->
If you want to move 5 AD roles to a different DC you can do that through GUI in different locations
Schema master
Naming master
PDC
RID master
Infrastructure master
To query which DC holds precedents roles you can utilize this command:
netdom query fsmo
Otherwise we can take a look to following article:
http://nolabnoparty.com/migrare-active-directory-a-windows-2012-r2-pt-2/
<-------------->
If you want to migrate DHCP settings you can utilize this command:
Export-DhcpServer –ComputerName dcname.domain.xxxx -Leases -File C:\temp\dhcpconfig.xml -verbose
To import DHCP settings to other Server:
Import-DhcpServer -ComputerName w12r2-dc01.nolabnoparty.local -Leases -File C:\temp\dhcpconfig.xml -BackupPath C:\temp\dhcp_backup\ -verbose Type Y to proceed with import.
Later you will need to authorize DHCP on new DC
[original article http://nolabnoparty.com/migrare-active-directory-a-windows-2012-r2-pt-3/]
[update 2022.03.15]
Active Directory Health Check: Troubleshooting
https://social.technet.microsoft.com/wiki/contents/articles/32911.active-directory-health-check-troubleshooting.aspx