SCANNING METHOD OF MAGNETIC DISC CONTROL DEVICE

摘要

PURPOSE:To provide I/O service uniformly to respective systems by varying a scanning ratio in a rough coupled multiprocessing system. CONSTITUTION:A magnetic disc control device 4 is provided with plural request storage parts 5-A-5-D, a request writing part 6 and a request fetching part 7 so as to accept preferentially a start instruction request from a system 1-2 connected to a channel connection terminal (B terminal e.g.). Since the ratio scanning the request storage parts 5-A-5-D is fixed in accordance with the speed of a central processor, the scanning ratio can be increased in a request storage part corresponding to a system having many I/O requests.