IBM MQ logging

The queue manager logs all persistent messages in active and archive logs in a manner similar to Db2®. Extra overhead is required for message logging, which can affect performance.

By default, all IBM® MQ messages that are used in replication and publishing are persistent. In the event of a forced shutdown or system failure, persistent messages can be recovered and data at the source and target remains in synch.

Ideally, you should store the log files required by MQ on a separate physical disk from the data files that are used for message queues. This separation of files can dramatically reduce I/O contention and improve performance.

If possible, use disk striping for the queue manager logs to allow for parallel I/O and to speed recovery time.