PowerCenter has a service-oriented architecture that provides the ability to scale services and share resources across multiple machines. The Informatica domain supports the administration of the PowerCenter and Informatica services. A domain is the primary unit for management and administration of services in PowerCenter.
A domain contains the following components:
One or more nodes.
A node is the logical representation of a machine in a domain. A domain may contain more than one node. The node that hosts the domain is the master gateway for the domain. You can add other machines as nodes in the domain and configure the nodes to run application services such as the Integration Service or Repository Service. All service requests from other nodes in the domain go through the master gateway.
A node runs service processes, which are the runtime representation of the application services running on a node.
The Service Manager is built into the domain to support the domain and the application services. The Service Manager runs on each node in the domain. The Service Manager starts and runs the application services on a machine.
A group of services that represent Informatica server-based functionality. The application services that run on each node in the domain depend on the way you configure the node and the application service.
You use Informatica Administrator to manage the domain.
If you have the high availability option, you can scale services and eliminate single points of failure for services. The Service Manager and application services can continue running despite temporary network or hardware failures. High availability includes resilience, failover, and recovery for services and tasks in a domain.
The following image shows a Informatica domain with three nodes:
This domain has a master gateway on Node 1. Node 2 runs a PowerCenter Integration Service, and Node 3 runs the PowerCenter Repository Service.