Environment Verification

Whether Control-M/Tape performs real-time operations during volume access depends on:

• Whether the Control-M/Tape Real-Time environment has been established.
• Whether Control-M/Tape is currently in an active state, and not in a suspended or dormant mode.

Whenever Control-M/Tape takes control during volume processing, it attempts to locate the Control-M/Tape Control Table. The Control-M/Tape Control Table is loaded into memory during Initialization. For additional information, see Initialization.

If the Control-M/Tape Control Table is not found, Control-M/Tape halts the job and issues a message to the operator. The operator can then choose to:

• Let the job continue without Control-M/Tape intervention.
• Abend the job.
• Start up Control-M/Tape and continue job processing.
  • If the Control-M/Tape Control Table is found, the current status of Control-M/Tape is checked.

If Control-M/Tape is active, processing continues normally.

• If Control-M/Tape is dormant, the job continues without Control-M/Tape intervention.
• If Control-M/Tape is suspended, any job trying to access tape volumes is halted and the operator is notified.

Note: For a discussion of active, dormant, and suspended modes, see the topic about the Control-M/Tape initialization CTTINT procedure in the INCONTROL for z/OS Administrator Guide.

If a job is failed by Control-M/Tape, the job abends with user code 242 and a specific reason code. The abend is preceded by a message describing the problem.

Whenever possible, Control-M/Tape checks are performed before the operator mounts the volume, thus saving operator time and computer resources.