Each vRealize Automation appliance includes a connector that supports user authentication, although only one connector is typically configured to perform directory synchronization.
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To support Directories Management high availability, you must configure a second connector that corresponds to your second vRealize Automation appliance. That second connector connects to the same Identity Provider and, through VMware Identity Manager, points to the same Active Directory instance. With this configuration, if one appliance fails, the other can take over management of user authentication.
In a high availability environment, all nodes must serve the same set of users, authentication methods, and other Active Directory constructs. The most direct method to accomplish this is to promote the Identity Provider to the cluster by setting the load balancer host as the Identity Provider host. With this configuration, all authentication requests are directed to the load balancer, which forwards the request to either connector as appropriate.