Equivalent assurance processing method of equivalent assurance processing apparatus and dual volume of redundant volume

摘要

PROBLEM TO BE SOLVED: To provide a means for reducing an area requiring a whole equivalence guaranteeing processing to shorten time by executing the equivalence guaranteeing processing on the area in which the equivalence guaranteeing processing can be executed by an application program with the logic of the application program with respect to the equivalence guaranteeing processor of a duplex volume. SOLUTION: A processor is provided with an equivalence guaranteeing processing means by individual applications 5 executing the equivalence guaranteeing processing in the area based on an area management table for equivalence guaranteeing processing object by individual applications 2 on the application program managing the completion recognition of writing and an equivalence guaranteeing processing selection means 3 selecting the equivalence guaranteeing processing means by individual applications 5 or a whole equivalence guaranteeing processing means 4 as the equivalence guaranteeing processing for respective volume areas based on a volume state management table 1 and the area management table of equivalence processing object by individual applications 2.