
In a WebLogic Server cluster, most subsystem services are hosted homogeneously on all server instances in the cluster, enabling transparent failover from one server to another. In contrast, pinned services, such as JMS-related services, the JTA Transaction Recovery Service, and user-defined singleton services are hosted on individual server instances within a cluster—for these services, the WebLogic Server migration framework supports failure recovery with service migration, as opposed to failover. Service-level migration in WebLogic Server is the process of moving the pinned services from one server instance to a different available server instance within the cluster. Service migration is controlled by logical migratable target, which serves as a grouping of services that is hosted on only one physical server in a cluster. You can select a migratable target in place of a server or cluster when targeting certain pinned services. High availability is achieved by migrating a migratable target from one clustered server to another when a problem occurs on the original server. You can also manually migrate a migratable target for scheduled maintenance or you can configure the migratable target for automatic migration. The migration framework provides tools and infrastructure for configuring and migrating targets, and, in the case of automatic service migration, it leverages WebLogic Server's health monitoring subsystem to monitor the health of services hosted by a migratable <b>...</b>
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