Planning your z/OS UNIX or UNIX System Services environment

Certain processes within the IBM® MQ queue manager (MSTR) and the channel initiator (CHIN) use z/OS® UNIX or UNIX System Services for their normal processing. Plan your configuration if you do not want to use the default UNIX System Services configuration.

No special action or customization is necessary in order for IBM MQ to use UNIX services as long as a system-wide default OMVS segment has been set up.

Users who do not want IBM MQ to invoke UNIX System Services, using the guest or default UID and OMVS segment, need only model a new OMVS segment based on the default segment, as IBM MQ requires no special permissions, and does not run within UNIX as a superuser.

The MSTR and CHIN started task user Ids also need a UID in the RACF OMVS segment.