DATA ARRANGEMENT CONTROL PROGRAM, DATA ARRANGEMENT CONTROLLER, DATA ARRANGEMENT CONTROL METHOD, AND MULTI-NODE STORAGE SYSTEM

摘要

PROBLEM TO BE SOLVED: To arrange data in accordance with reduction in electric power consumption.

SOLUTION: An access statistical information collecting means 1a of a control node 1 collects access statistical information from disk nodes 2, 3, etc. A non-access probability calculating means 1b calculates a value, which is increased as data access frequency in a predetermined time is reduced, as a data non-access probability of each data. An arrangement pattern candidate generating means 1c generates plurality of arrangement pattern candidates indicating the disk nodes to store the data. An expected value calculation means 1d calculates an expected non-access time value indicating an expected value of the time where no access occurs to any of the disk nodes for each of the generated arrangement pattern candidates. An arrangement pattern determining means 1e determines the arrangement pattern candidate having the maximum expected non-access time value as a data rearrangement pattern.

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