What is hamanager

IBM WebSphere Application Server Network Deployment V6 introduces a new feature called High Availability Manager (commonly called HAManager) that enhances the availability of WebSphere singleton services such as transaction or messaging services. It provides a peer recovery mechanism for in-flight transactions or messages among clustered WebSphere application servers.HAManager enhances teh availability of singleton services in WebSphere. THese singleton services include

• Transaction service - Transaction log recovery


• Messaging service - Messaging engine restarting

The HAManager runs as a service within each WebSphere process (Deployment Manager, Node Agents, or application servers) that monitors the health of WebSphere singleton services. In the event of a server failure, the HAManager will failover any singleton service that was running on the failed server to a peer server. Examples of such a failover include the recovery of any in-flight transactions or restarting any messaging engines that were running on the failed server.The HAManager runs as a service within each WebSphere process (Deployment Manager, Node Agents, or application servers) that monitors the health of WebSphere singleton services. In the event of a server failure, the HAManager will failover any singleton service that was running on the failed server to a peer server. Examples of such a failover include the recovery of any in-flight transactions or restarting any messaging engines that were running on the failed server.