| 摘要 |
The present invention makes it possible to change over a volume transparently with respect to a host. A first storage device 2 A and a second storage device 2 B are connected through a communication network 3 B; a volume 8 provided by the second storage device 2 B is mapped as a volume of the first storage device 2 A. A host 1 is capable of accessing either of the volume 6 or volume 8 via a virtual LU 4 . A connection control unit 5 , which may be constructed of tables or the like, connects the virtual LU 4 to either one of volume 6 and volume 8 . Changeover of the connection target is performed transparently with respect to the host 1 and so is not recognized by the host 1 . Consequently, the actual data storage target volume can be changed over while the host 1 always accesses the same virtual LU 4.
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