Definition of ATTACH



Connects a real DASD device to CP or other real devices to a VM

Priviledge Class A or B

Gives exclusive use of a real device to a particular VM. Also connects a real DASD to
CP's control. A user will normally make a request to the operator for a specific device.
You can specify the real address as a single unit, a list of units, or a range of units.
DASD devices may be specified as read only.

Reference the detailed IBM manaul page here.