IO processing method and system

The invention provides an IO processing method and system, and the method comprises the steps: respectively deploying data management modules in a plurality of processors of a solid state disk, dividing the plurality of processors into a plurality of groups, and selecting a specified processor in each group according to a preset rule; taking the data management module deployed in the specified processor as a main management module, and taking the data management modules deployed in other processors in the group as standby management modules respectively; if the main management module receives the IO command, calculating the currently processed data flow, and judging whether the currently processed data flow exceeds the maximum processing flow or not; and if the currently processed data flow exceeds the maximum processing flow, the main management module checks the to-be-processed data flow of the corresponding standby management modules, so that one of the standby management modules is selected as a selected