What happens at failover in a Microsoft cluster

If an active node fails, the Enterprise Vault virtual server attempts to fail over to the next available node in the resource group's preferred node list, assuming all the resources have that node as a possible owner. The Server Instance resource fails over first, provided the failover node is not already running an Enterprise Vault virtual server. The remaining resources then fail over in order of dependency. The resources start the Enterprise Vault services on the failover node, ensuring continuing availability for the data that Enterprise Vault is managing and archiving.