WebSphere High Availability Manager

High Availability Manager on WebSphere Application Server WebSphere Support Team technical resolutions to common problems with High Availability Manager.

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High Availability Manager

A high-availability manager provides several features that allow other WebSphere Application Server components to make themselves highly available:

A framework that allows Singleton services to make themselves highly available. Examples of singleton services that use this framework include the transaction managers for cluster members, and the default IBM messaging provider, commonly referred to as Service Integration Bus.

A mechanism that allows servers to easily exchange state data. This mechanism is commonly referred to as the bulletin board.

A specialized framework for high speed and reliable messaging between processes. This framework is used by domain replication services when WebSphere Application Server is configured for memory-to-memory replication.

State data exchange

The high availability manager provides a specialized messaging mechanism that enables processes to exchange information about their current state. Each process sends or posts information related to its current state, and can register to be notified when the state of the other processes changes. The workload management (WLM) component uses this mechanism to build and maintain routing table information. Routing tables built and maintained using this mechanism are highly available.

Replication

The data replication service (DRS) that is provided with the product, is used to replicate HTTP session data, stateful EJB sessions, and dynamic cache information among cluster members. When DRS is configured for memory-to-memory replication, the transport channels defined for the high availability managers are used to pass this data among the cluster members.

MustGather Documentation

Webcast replay: HAManager Overview and Common Issues

Webcast replay: WebSphere High Availability Manager (HAManager) – Concepts and Problem Determination

Troubleshooting

3 Ways to resolve CWRLS0030W

DCSV messages appearing in the SystemOut.log file:

CWRLS0030W message continuously logged, and WebSphere Application Server fails to open for e-business due to DCSV8030I message

Learning more about the HA Manager

High availability manager

Establishing high availability

Core group scaling considerations

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