Recovering from power loss or communications failures

IBM MQ can recover from both communications failures and loss of power. It can also sometimes recover from other types of problem, such as inadvertent deletion of a file.

In the case of a communications failure, persistent messages remain on queues until they are removed by a receiving application. If the message is being transmitted, it remains on the transmission queue until it can be successfully transmitted. To recover from a communications failure, we can usually restart the channels using the link that failed.

If you lose power, when the queue manager is restarted IBM MQ restores the queues to their committed state at the time of the failure. This ensures that no persistent messages are lost. Nonpersistent messages are discarded; they do not survive when IBM MQ stops abruptly.