When a single process is running, the failover behavior depends on the following sources of failure:
Service Process
If the service process shuts down unexpectedly, the Service Manager tries to restart the service process. If the Service Manager cannot restart the process, the process stops or fails.
When you restart the process, the PowerCenter Integration Service restores the state of operation for the service and restores workflow schedules, service requests, and workflows.
The failover and recovery behavior of the PowerCenter Integration Service after a service process fails depends on the operating mode:
Normal. When you restart the process, the workflow fails over on the same node. The PowerCenter Integration Service can recover the workflow based on the workflow state and recovery strategy. If the workflow is enabled for high availability recovery, the PowerCenter Integration Service restores the state of operation for the workflow and recovers the workflow from the point of interruption. The PowerCenter Integration Service performs failover and recovers the schedules, requests, and workflows. If a scheduled workflow is not enabled for high availability recovery, the PowerCenter Integration Service removes the workflow from the schedule.
Safe. When you restart the process, the workflow does not fail over and the PowerCenter Integration Service does not recover the workflow. It performs failover and recovers the schedules, requests, and workflows when you enable the service in normal mode.
Service
When the PowerCenter Integration Service becomes unavailable, you must enable the service and start the service processes. You can manually recover workflows and sessions based on the state and the configured recovery strategy.
The workflows that run after you start the service processes depend on the operating mode:
Normal. Workflows start if they are configured to run continuously or on initialization. You must reschedule all other workflows.
Safe. Scheduled workflows do not start. You must enable the service in normal mode for the scheduled workflows to run.
Node
When the node becomes unavailable, the restart and failover behavior is the same as restart and failover for the service process, based on the operating mode.