| 摘要 |
A hierarchical storage system according to an embodiment comprises a first storage device used as an upper tier storage device, a second storage device used as a lower tier storage device, and a storage controller. In a replication initialization process for setting a first logical disk and a second logical disk as a master logical disk and a sub-logical disk, respectively, and synchronizing these disks with each other, the replication controller in the storage controller causes the type of a physical extent which is to be allocated to a second logical extent in the second logical disk, corresponding to a first logical extent in the first logical disk, to coincide with the type of a first physical extent currently allocated to the first logical extent. |
