Method and apparatus for processing input/output requests from a plurality of channel buses

摘要: In order to share out central resources fairly between low-speed and high-speed input/output ports 20-1, 20-2 of an control unit, activation time a point when end status associated with the transfer is sent request received measured stored in memory 48. When port receives from channel, respect read during this for preferentially accepted. To provide minimum time, average maximum are obtained result measurement. Any these three times can be selected as substantially equalize busy ratios ports. Allocation also made alternative ways, instance by reference number requests which meet signal.