BRMS can send the operator a message to mount a volume when the device needs one. This message provides the operator with a list of available media in the required media class. BRMS calls this procedure Next volume message, and it comes ready to use with the standard BRMS product. You can find the Next volume message prompt on the add and change options on the WRKDEVBRM command.
During the backup process, BRMS checks all volumes that it uses for save operations to ensure that you enrolled them into the media inventory. If they are not, BRMS issues a message that informs the operator and continues the operation. However, if you try to use a mix of enrolled and unenrolled media to perform a save, then BRMS stops the operation. BRMS then sends an error message and waits for instruction to continue or cancel the job. BRMS cannot update the media information records with information about this save because the volumes are not enrolled in BRMS. Consequently, BRMS cannot protect the data against overwriting. BRMS does not automatically enroll the volume unless you change the Auto enroll media field in the system policy to *YES. Good media management relies on specific enrollment of media volumes to the media inventory.
You can find the Next volume message prompt on the Change Tape Device display, which you can access from the Work with Devices display. If you do not want BRMS to send a message to insert the next volume, change the value in this field to *NO.