Find ISTG Server

Powershell:

$BHservers = ([adsi]”LDAP://CN=IP,CN=Inter-Site Transports,CN=Sites,CN=Configuration,DC=admin,DC=com”).bridgeheadServerListBL

$BHservers | Out-GridView

Refer : https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2003/cc755994(v%3dws.10)#active-directory-kcc-architecture-and-processes

Force rebuild Active Directory Replication Topology across Site Links

RAID Levels Comparison