The log control file
The log control file contains the information needed to control the use of log files, such as their size and location and the name of the next available file.
The log control file is for internal queue manager use only.
The queue manager keeps control data associated with the state of the recovery log in the log control file and you must not modify the contents of the log control file.
Note: Ensure that the logs created when you start a queue manager
are large enough to accommodate the size and volume of messages that
your applications will handle. You will probably need to change the
default log numbers and sizes to meet your requirements. For more
information, see Calculating the size of the log.