| 摘要 |
Proposed is a convenient computer system and data access control method which, while protecting data in a snapshot, enable restoration in operational volume file units. If a read request to read a stubbed file in the snapshot is supplied, the data of the file is acquired from a second logical volume of an archive destination by means of recall processing and the acquired data is transmitted to the source of the read request after writing the acquired data to the snapshot, but, if a write request to write to a file in the snapshot is supplied, the write request is rejected.
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