Topology with separate instances of IBM InfoSphere Information Server

AIX® HP-UX Solaris Linux: You can install more than one instance of InfoSphere® Information Server on the same set of computers. MicrosoftWindows: You cannot install more than one InfoSphere Information Server instance on a computer.

The instances are isolated from one another, with separate engine tiers, services tiers, and metadata repository tiers. These tiers cannot be shared between instances. The instances can exist on the same computer in different installation directories or on different computers. The instances can be the same software version or different versions.

If the instances are the same InfoSphere Information Server version, you can configure a single client tier instance to communicate with multiple InfoSphere Information Server instances. The following diagram shows a topology with two separate InfoSphere Information Server, Version 8.5 instances that are installed on two separate computers. A single client tier installation communicates with both instances.

Figure 1. Topology with separate instances on separate computers

If the instances are different versions, the client tier must contain clients for each version. The following diagram shows a topology with two separate InfoSphere Information Server instances that are installed on two separate computers. The instances are different versions. The client tier contains clients for both versions. The Multi-Client Manager is used to switch between one version of IBM® InfoSphere DataStage® to another version that is also installed on the client tier.

Figure 2. Topology with separate different version instances on separate computers

If the services tiers for more than one instance exist on the same computer, specify different ports for each services tier. The following diagram shows a topology where the services tiers and metadata repository tiers for two different InfoSphere Information Server version instances are installed on the same computer. Each services tier communicates with a separate engine tier installed on a separate computer.

Figure 3. Topology where services tiers share a common computer

To install more than one instance of the InfoSphere Information Server engine on the same computer, create an installation tag (ITAG). An ITAG must be exactly three hexidecimal digits. The ITAG value is used when assigning shared memory segments so that each installation creates its shared memory in different locations. To perform this installation, run the installation program multiple times to create multiple engine tier instances. During the installation, assign each instance a unique identification tag and port number. All projects and jobs associated with a server engine instance are assigned the tag for the server engine instance.

Each engine tier instance must be registered to a different InfoSphere Information Server service instance.

The following diagram shows a topology where the engine tiers for two InfoSphere Information Server instances are installed on the same computer. Each engine tier has an associated ITAG.

Figure 4. ITAG installation