Client failover

When the client connection to the Data Archive server is configured for high availability, clients automatically connect to another Data Archive server within the collective if the current server becomes unavailable. This behavior is known as client failover. When failover occurs, clients switch to another Data Archive server of the collective to minimize the effects of the disruption. When the original server comes back online and becomes visible to the client, the client switches back automatically.

Regardless of the connection type, the client attempts to connect to another Data Archive server within the collective based upon a set of factors including connection preference set for each client application and connection priority set across all applications on the client machine.

The application-specific connection preference is the first factor considered by failover, and can be set to either require the primary Data Archive server, prefer the primary server, or a preference to any member-type of the collective. If the connection preference is set to the any, failover considers the connection priority values, which are set for all the applications on the client machine. In this scenario, the client fail overs to the server with the highest priority value.