Foley & Lardner LLP
Hierarchical management storage system and storage system operating method
The storage system eliminates inconsistency between a stub, and a file data storage location indicated by the stub. In a storage system that executes HSM using stubs, information relating to a higher tier, which is a data migration source, is recorded during data migration. The stub in the higher tier is correctly restored using the higher-tier information thus recorded. The stub is restored, and inconsistency between information in the HSM layers is resolved.
Hitachi, Ltd.
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Akira Nobumitsu Takahiro
Ito Takaoka Nakano