Hitachi, Ltd.

Eiji Sambe

Nobuyuki Saika

Xiaolin Wang

The present invention concerns allocating files in storage apparatuses efficiently while satisfying requirements of the files. An information systemincludes a first server systemcoupled to a first storage apparatus, a second server systemcoupled to a second storage apparatus, and a third server systemcoupled to a third storage apparatus. When the first server systemreceives a data I/O not needing access to the entity of a file responds to the data I/O request using metadata of the file and when the first server systemreceives a data I/O needing access to the entity of a file acquires the entity of the file from the second storage apparatusor the third storage apparatusto process the data I/O request. The first server apparatus determines the allocation target of the entity of the files on the basis of a requirement set for the files and information relating to configurations of the storage apparatuses

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Odawara, Japan

Eiji Sambe