Log file location

When choosing a location for the log files, remember that operation is severely affected if IBM MQ fails to format a new log because of lack of disk space.

If we are using a circular log, ensure that there is sufficient space on the drive for at least the configured primary log files. Also leave space for at least one secondary log file, which is needed if the log has to grow.

If we are using a linear log, allow considerably more space; the space consumed by the log increases continuously as data is logged.

We should place the log files on a separate disk drive from the queue manager data.

Data integrity on this device is paramount - we should allow for built in redundancy.

It might also be possible to place the log files on multiple disk drives in a mirrored arrangement. This protects against failure of the drive containing the log. Without mirroring, you could be forced to go back to the last backup of the IBM MQ system.