| 摘要 |
A new storage tier is added to a plurality of storage tiers configured in storage areas of a plurality of types of storage devices, whose processing performance is different from each other, without changing its operation form. If a new Tier3 constituting a file system FS4 is added between Tier2 and Tier3, a file server 16 adds a registered generation 1 to a tier number change management table 78, sets Tier3 as the added file system FS4 in the registered generation 1, manages Tier4 as a file system FS5, which has been changed from the former Tier3, adds a policy corresponding to a policy number 1005 to a migration policy management table76, updates only the registered generation from 0 to 1 for policy numbers 1002, 1005, and manages the migration policy management table.
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