Importance

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Abstract

A plurality of nodes includes an I/O (Input/Output) node and a plurality of computation nodes. Each computation node sends an I/O request to the I/O node. The I/O node includes a first storage device which stores data to be written or read according to the I/O request and a first memory device on which a first cache area is based to temporarily store the data written in the first storage device or read from the first storage device. The computation node includes a second memory device on which the second cache area is based to temporarily store the data according to the I/O request. At least one of the I/O node and the computation node stores management information which contains information on a physical storage area in the cache area of the other one of the I/O node and the computation node, and information on a virtual storage area which is associated with the physical storage area and has a part of its own cache area. A target node in the plurality of nodes controls arrangement of data stored in the second cache area based on the management information of the computation node or the management information of the I/O node.

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First Claim