| 摘要 |
A storage system constructed by combining a plurality of types of storage media differing in physical properties is managed as a single virtual storage. Consequently, a single file is divided into actual data and the identification information for accessing the actual data and then the identification information for access is associated with a file system for management purposes. Further, files are managed in a layered manner, in accordance with use frequency categories to manage the move of files between the categories. When the actual data in a file is to be moved to a storage medium in a lower level category, the actual data is backed up on another storage medium in a still lower level category.
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