Advantages

WebSphere's workload management provides excellent failover and scalability support for almost all applications. However, with the addition of HACMP, there are some advantages: Provides two-phase commit transaction and transaction log automatic failover. WASs act as coordinators of distributed transactions and write the transaction logs in the <Install_Root>/WebSphere/AppServer/tranlog directory. If an appserver fails after the start of the two-phase commit, the transaction manager will wait for the application to be restarted to complete the transaction. If the node hosting the application server fails, the transaction cannot be completed, and the corresponding database rows are locked until the transaction can be completed. With IP takeover, a new application server is restarted, with access to the tranlog, and the transaction can be completed automatically. Provides automatic appserver failover if a machine has an unrecoverable error such that the client will not perceive a performance impact during failover. Without an HACMP cluster, the machine that encounters an error (and hosting an application server that is servicing requests) needs to be manually rebooted to recover the server process.

Although such configuration offers the advantages mentioned above, it is a highly complex configuration.

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WebSphere is a trademark of the IBM Corporation in the United States, other countries, or both.

 

IBM is a trademark of the IBM Corporation in the United States, other countries, or both.