Choosing The Active Node For A Service

• In most A/P cluster software, the administrator defines a "primary" node for each service.
• When the cluster is in normal mode, each service will run on its primary node.
• In case the primary node fails, a secondary node will take over the service.
• In some cluster configurations, when the active node is working again, it will immediately take the service back from the secondary node. This is known as "automatic fail-back".
• When a cluster group runs more then one service, it will be wise to choose a different primary node for different services, to achieve better overall performance.

Originally written by guy keren