Manage replication in cluster

Replication is a service provided by WAS that transfers data, objects, or events among application servers. Data replication can be used to make data for session manager, dynamic cache, and stateful session beans available across many application servers in a cluster.

Review the following information to manage replication:
Dynamic caching

Data replication service (DRS) is the internal WAS component that replicates data among application servers. There are several types of data replication, and WebSphere Portal can make use of data replication for dynamic caching and for memory-to-memory replication of session data. Enable data replication for dynamic caching in a cluster environment is absolutely necessary to maintain data integrity between multiple WebSphere Portal nodes in the cluster. Replication also helps improve performance by generating data once and then replicating it to other servers in the cluster.

Table 1. Links to information about dynamic cache service settings by OS

OS	Additional information
Windows™ UNIX™	Dynamic cache service settings
i	Dynamic cache service settings

Memory-to-memory session replication	i: Memory-to-memory replication
Database session persistence	i: Configure for database session persistence

Distributed sessions

WebSphere Portal can use the WAS capabilities to support HTTP session failover, which enables one node in a cluster to access information from the existing HTTP session in case of a failure in the cluster node originally handling that session. This capability is referred to as distributed sessions. WAS provides two techniques that can be used for distributed sessions, either of which can be used in a WebSphere Portal cluster. Distributed session support is not enabled by default, so you will have to determine whether to provide this capability in cluster, and, if so, which of the two techniques you will use: memory-to-memory session replication and database session persistence.

Table 2. Links to information about distributed sessions by OS

OS	Additional information
Windows UNIX	For general information, see Session management support. For memory-to-memory information, see Memory-to-memory replication. For database session information, see Configure for database session persistence.
i	For general information, see Session management support. For memory-to-memory information, see Memory-to-memory replication. For database session information, see Configure for database session persistence.

Parent

Manage the cluster

  Fixed links that were pointing to WAS 61 to WAS 7.

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