UNLOAD command

Use the UNLOAD command to unload mounted tape or DASD volumes.

In a JES3 complex, use the UNLOAD command carefully. When you request that a volume be removed from a JES3-managed direct access device, you must enter an UNLOAD command on each system in the complex that has access to the device. In addition, if you are requesting that a volume be removed from a JES3-managed unit, you must also enter a JES3 unload command (*MODIFY,S,U=...). See z/OS JES3 Commands.