Scenario C: Two-server active-passive high availability configuration

Scenario C is a configuration that includes two computers that can fail over to one another in case of failure.

An industrial company has purchased IBM® InfoSphere® Information Server and plans to use IBM InfoSphere DataStage®, IBM InfoSphere QualityStage®, and IBM InfoSphere Information Analyzer for data integration. They expect to have three or four developers for the project.

Even if they are a small company that does not expect much volume on the production system, the company cannot afford much downtime of the system. The system must be highly-available. To minimize hardware costs, they decide to implement a two-server active-passive topology for this system. All components are to run on one server and fail over to the other server if a hardware, network, or operating system failure occurs, or if an administrator forces a failover for maintenance purposes. While the failover is occurring, the system is nonoperational.

They decide to create two separate IBM InfoSphere Information Server installations:

• A small development system where projects and jobs are built and tested. The configuration is identical to Sample scenario A: Basic client-server topology.
• A more highly available production system, using the two-server active-passive configuration with a storage mechanism.

Several client workstations will access both systems.

To increase processing throughput, the passive node will be used as a parallel engine compute node while the primary node is active.

The following diagram illustrates this topology.

Figure 1. Scenario C configuration