vary offline

1. To change the status of a device from online to offline. When a device is off line, no data set may be opened on that device.; 將設備的聯機狀態改為脫機狀態。當設備脫機時，在此設備上不能打開任何數據集。 2. To place a device in a state where it is not available for use by the system; however, it is still available for executing I/O. | 把設備置于系統不能使用的狀態，然而，對于執行輸入輸出，它仍然是可用的。