Symantec does not support installing the Discovery Accelerator server software on any node in a Windows Server failover cluster or Veritas Cluster Server (VCS) cluster. So, if you have configured Enterprise Vault for use in a cluster, you must not install the server software on one of the cluster nodes. However, an unclustered Discovery Accelerator installation can reference a clustered Enterprise Vault virtual server.

In addition, you can enhance the scalability, performance, and high availability of Discovery Accelerator by configuring it for use in a Network Load Balancing cluster.

See Configuring Discovery Accelerator for use in a Network Load Balancing cluster