To prevent service disruptions when an Identity Resolution server fails, you can set up high availability. To set up high availability, use server groups in an active-passive configuration. Server groups provide redundancy by allowing several Identity Resolution servers to run concurrently on different nodes.

When you use server groups to set up high availability, one of the servers in the group becomes the primary server. The other servers on the other nodes assume the role of secondary servers. If the primary server goes down, one of the secondary servers becomes the primary server. The primary server that fails becomes a secondary server after it recovers.