(1) The type of media that an object is stored on. It is not directly associated with a physical location; however, it is directly associated with the device manager. See also storage group, storage system.
(2) In WebSphere MQ for z/OS, the page set that is to hold the messages for a particular queue. The storage class is specified when the queue is defined.
(3) A named list of data-set storage attributes that identify performance goals and availability requirements. A storage class is defined by the storage administrator to select a device that can meet those goals and requirements.