Enable large queues

IBM MQ supports queues larger than 2 GB.

On Windows systems, support for large files is available without any additional enablement.

On UNIX and Linux systems, we need to explicitly enable large file support before we can create queue files larger than 2 GB. See your operating system documentation for information on how to do this.

Some utilities, such as tar, cannot cope with files greater than 2 GB. Before enabling large file support, check your operating system documentation for information on restrictions on utilities we use.

For information about planning the amount of storage we need for queues, see MQ Performance documents for platform-specific performance reports.

From IBM MQ Version 9.1.5, we can control the size of queue files using a new attribute on local and model queues. See Modifying IBM MQ queue files for more information.