VideoOS.DataCollector.Service.exe has to be replaced 
VideoOS.DataCollector.Service.exe.config has to be replaced on all cluster nodes and edited by adding:


For Data Collector Config File on Management Server Cluser Nodes:

<add key="ClusterAddress" value="ROLENAME.DOMAIN_NAME" />
<add key="ClusterApplicationId" value="GUID_SAME_FOR_BOTH_ManagementServer_NODES" />



For Data Collector Config File on Event Server Cluster Nodes:

<add key="ClusterAddress" value="ROLENAME.DOMAIN_NAME" />
<add key="ClusterApplicationId" value="GUID_SAME_FOR_BOTH_EventServer_NODES" />