Control region failures

Software errors that cause an abend or a loop, or failures that are related to system data sets (including the log data sets) can cause control region failures. After you determine and correct the cause of the failure, you can restart the system by using the /ERESTART command.

If the failure results in a loop in the control region, you might need to force termination of the region with the z/OS® MODIFY command.

When the IMS control region fails, APPC/MVS terminates LU 6.2 conversations with the DEALLOCATE abend.

When the IMS control region fails, the CQS subsystem to which it is connected does not shut down. If you need to shut down the CQS subsystem, use the z/OS STOP or CANCEL command.