Use this task to configure the transaction properties required for peer recovery of failed application servers in a cluster.
Why and when to perform this task
The transaction service requires a common configuration in order to be able to perform peer recovery between servers. This means that peer recovery processing can only take place between members of the same server cluster. Although a cluster can contain both version 5 and version 6 servers, high availability for peer recovery must only be enabled and configured if all servers in the cluster are at version 6.
Configuring the transaction properties required for peer recovery is part of the overall task for configuring a cluster to use high availability support.
To configure the transaction properties required for peer recovery, complete the following steps:
Steps for this task
For peer recovery, each server in the cluster must be able to access the log directories of other servers in the same cluster. Interactions between the High Availability framework and the recovery log service prevent concurrent access to a single physical recovery log.
When using WebSphere Application Server without High Availability support, you can leave the recovery log configuration for persistent services (such as the transactions service) unset. The application server assumes a default location within the appropriate profile directory. When High Availability support is enabled, this default may not be visible from all servers in the cluster (for example, if they are in different profiles or physical nodes.) As a result, it is recommended that the recovery log location be configured for each server in the cluster before enabling High Availability.
The storage mechanism used to host recovery log files (for example, you can use IBM NAS and shared SCSI drives, but not simple network share) and access to that mechanism (for example, through a LAN), must support the file-based force operation that is used by the recovery log service to force data to disk.
For more information about configuring transaction log directories, see Configuring transaction properties for an application server.
For more information about creating a new policy, see Creating a policy for a high availability group.
Related concepts
Peer recovery
of transactions