Patent ID: 8527562
Filing Date: 2013-09-03
Classification: G06F,Y10S

Abstract:
1. A file storage system, comprising: three or more file storage apparatuses; and a management computer coupled to each of the three or more file storage apparatuses, wherein (A) the management computer stores therein migration path management information, which indicates a configuration of a migration path capable of including three or more file storage units arranged in a cascade form, and path history information, which indicates a change history of the configuration of the migration path, and (B) each time when the configuration of the migration path is changed, the management computer is configured to update the migration path management information to information indicating the changed configuration of the migration path, and to add the information indicating the changed configuration of the migration path to the path history information; wherein wherein changing the configuration of the migration path involves path change, which is to delete an intermediate file storage unit of the migration path from the migration path, in the abovementioned (B), the management computer is configured to delete information on the file storage unit to be deleted from the migration path management information, and to add, to the path history information, information that indicates the configuration of the migration path obtained after the path change, (X) a third file storage apparatus, which is associated with a third file storage unit that is a migration source file storage unit corresponding to the file storage unit to be deleted, is configured to acquire information on a link of a stub of the third file storage apparatus from the file storage apparatus associated with the file storage unit to be deleted, the management computer is configured to transmit, to the third file storage apparatus, a first path change instruction that includes information on a fourth file storage unit, which is a migration destination file storage unit corresponding to the file storage unit to be deleted, and to transmit, to a fourth file storage apparatus, a second path change instruction that includes information on the third file storage unit, which is the migration source file storage unit corresponding to the file storage unit to be deleted, the third file storage apparatus is configured to: the fourth file storage apparatus is configured to: