Patent ID: 8601230

Claim:
A computer-readable, non-transitory storage medium storing a program for causing a computer to carry out a migration of a volume from a first volume manager to a second volume manager, said migration comprising: causing said first volume manager to issue I/O orders for an entire volume of a physical medium in a state where there is no first mapping made by the first volume manager, between logical volume offsets and physical blocks on said physical medium; intercepting, by a program module, said I/O orders by said first volume manager to extract the first mapping, wherein said program module prevents said I/O orders from being outputted to said physical medium; judging whether or not said first mapping is identical to a second mapping based on volume configuration information stored in a header area on said physical medium; and upon detecting that it is judged that said first mapping is identical to said second mapping, updating a header area on said physical medium for said second volume manager.