DATA STORAGE SYSTEM AND CONTROLLING METHOD THEREOF

摘要

A storage system comprising a first storage apparatus, a second storage apparatus, each storing data processed by an external apparatus, each of the first and second apparatuses including a pool of a plurality of unit physical storage areas for storing the data, the unit physical storage areas being classified into a plurality of storage tiers, a logical storage area in the first storage apparatus and the logical storage area in the second storage apparatus respectively including one or more of the storage tiers that are assigned to the respective logical storage areas, the storage system holding storage tier construction information of the first storage apparatus, and a data migration controller, when the data stored in the first storage apparatus are migrated to the second storage apparatus, transferring the storage tier construction information of the first storage apparatus to the second storage apparatus.