| 摘要 |
PURPOSE:To reset a deadlock state by releasing the volume that a system occupies only when it is judged that a control program has a dead lock possibly. CONSTITUTION:When volumes 7a, 7b,... are in a stateIfor an input and output request issued by a host through one channel 3, the input and output request is executed and when in a state II, a busy state is reported to form a queue. When they are in a state III or IV, the presence of another volume which is occupied or in exclusive use from a corresponding channel and the presence of a queue showing an input and output request group to a corresponding volume are checked. When the queue is formed, a busy plus attention status is reported to give information on the possibility of a deadlock. |
