Task management control apparatus and method having redundant processing comparison

An information control apparatus comprising:

• a plurality of processors;
• a unit that controls input/output of data relating to a computation of said plurality of processors in response to an access request from a second input/output unit and an access request from a first input/output unit which requires higher reliability than said second input/output unit, and orders at least one of a plurality of processors to perform a computation relating to the access request from said first input/output unit away from the computation relating to the access request from said second input/output unit in case of that said first input/output unit issued an access request, so that a same computation is made by said plurality of processors;
• a unit that compares the results of said computations relative to the access request from said first input/output unit provided from said plurality of processors;
• and
• a unit that allows the data associated with said computations of said processors to be output on the basis of said compared results.

An information controlling method comprising the steps of:

• when an input/output control apparatus controls input/output of data relating to a computation of a plurality of processors in response to an access request from a second input/output unit and an access request from a first input/output unit which requires higher reliability than said second input/output unit,
• ordering at least one of a plurality of processors to perform a relatively high reliability computation away from a relatively low reliability computation in case of that said first input/output unit issued an access request, so that a same computation is made by said plurality of processors;
• in said plurality of processors, making a transition from the computation relating to said access request from said second input/output unit to the computation relating to said access request form said first input/output unit in response to a command from said input/output control apparatus;
• comparing the computed results from said plurality of processors by said input/output control apparatus;
• and
• allowing the output associated with the computations made by said processors to be supplied on the basis of said compared results by said input/output control apparatus.