Hieronder enkele quotes van websites m.b.t. het opzetten van een fail-over cluster i.c.m. domeincoltrollers:

You cannot add a domain controller as a node in a Windows Server 2012 failover cluster environment (https://support.microsoft.com/en-us/kb/2795523)

• It is not recommend to combine the Active Directory Domain Services role and the Failover Cluster feature on Windows Server 2003, Windows Server 2008, or Windows Server 2008 R2
• It is not supported for a Windows Server 2003, Windows Server 2008, or Windows Server 2008 R2 node in a Failover Cluster to be a Read-Only Domain Controller (RODC)
  (https://support.microsoft.com/en-us/kb/281662)

Domain Controllers as Cluster Nodes – Bad Idea (http://blogs.msmvps.com/clusterhelp/2008/02/12/domain-controllers-as-cluster-nodes-bad-idea/)