This SQL query will show if a server is a cluster, the name of the current host, and the name of the cluster.
IsClustered = serverproperty('IsClustered'),
HostName = serverproperty('ComputerNamePhysicalNetBIOS'),
ServerName = serverproperty('MachineName')
To look through such a large installation, you would probably need a Powershell script. I can't help you with that, but Google is your friend.
CODO ERGO SUM