| 摘要 |
PURPOSE:To reduce a main storage area used for selecting a channel path by providing a rotation pointer used for selecting a sub-channel belonging to a logical control unit in the control table of the logical control unit. CONSTITUTION:The value of the next pointer 49 of the sub-channel 44 is copied on the top sub-channel pointer 51 of the logical control unit 47 and the value of the rotation pointer 51 is added by '1' and set to 0.2. When a channel processor 33 pays attention to the control table 47 of the logical control unit, the channel processor 33 similarly fetches the sub-channel 45. At this time, similarly, when a rotation algorithm, namely, the algorithm for sequentially using an I/O path included in the logical control unit is used, the channel processor 33 checks a path 36-40-43 by the value of the rotation pointer 50 of the control table 47 of the logical control unit. |
