Progress
Installation and Configuration Guide
Version 9
for UNIX


Connection-level Fault Tolerance

Connection-level fault tolerance enables a client (AppServer client, SonicMQ Adapter, WebSpeed Messenger, or DataServer client) to have its connection request satisfied by any NameServer from a set of related NameServers. You can configure NameServers for fault-tolerant operation using two different techniques, and you can use these techniques independently or together:

Using either or both techniques, a client can get multiple responses from multiple NameServers. The client uses the first response that indicates that the requested Application Service was found. A client only gets a connection error if all NameServers that respond indicate that the Application Service cannot be found.

In general, you can combine NameServer replication with NameServer neighbors to provide connection-level fault tolerance across an entire network. The following sections describe how to implement connection-level fault tolerance using these techniques.


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