| 摘要 |
PROBLEM TO BE SOLVED: To execute data movement between new and old storage devices by file units without any interference of a host computer. SOLUTION: A new storage device sub-system 3 is provided with two interfaces 31 and 32, and connected with a host 1 and an old storage device sub-system 2. The new storage device sub-system 3 copies the data of a volume in the old storage device sub-system 2 to its own volume in the order of the head, and records the position at which the copy is completed in a copy pointer 43. Also, the new storage device sub-system 3 accepts access from the host 1 as if it is access from the old storage device sub-system 2.
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