Patent ID: 7644301
Filing Date: 2010-01-05
Classification: G06F

Abstract:
1. A management computer coupled to a storage system included in a computer system, the storage system including a primary logical volume in which data is stored, and a secondary logical volume in which a replication of the data stored in the primary logical volume is stored, wherein the primary logical volume and the secondary logical volume form plurality of pairs including a first pair and a second pair, the management computer comprising: an interface coupled to the storage system, a processor coupled to the interface, and a memory coupled to the processor, wherein the processor obtains an event regarding the second pair, determines whether the event is caused by a fault occurring in the second pair, determines data made to be inconsistent by the fault in a case where the event is caused by the fault, and outputs information on the inconsistent data, wherein the management computer has management information including information on a pair status of the second pair, where the pair status may be any one type of a plurality of differing types of pair statuses, wherein the determination whether data is made to be inconsistent by the fault is based on the type of pair status for the second pair immediately before the occurrence of the event regarding the second pair, wherein management information referred to by the management computer is stored in the computer system, wherein the management information includes information on an application status of the primary logical volume, the plurality of types of different pair statuses includes a first type pair status in which, when data of the primary logical volume is updated, the updated data is replicated to the secondary logical volume, a second type pair status in which replication of the updated data is suspended, and a third type pair status in which, in order to change the second type pair status to the first type pair status, data is replicated from the primary logical volume to the secondary logical volume, the application status includes an operation status in which data access is performed with respect to the primary logical volume, wherein the processor: determines that the data of the secondary logical volume of the second pair in which the fault has occurred has not been made to be inconsistent by the fault, in a case where a pair status immediately before the occurrence of the fault of the second pair in which the fault has occurred is the second type pair status; determines that the data of the secondary logical volume of the second pair in which the fault has occurred has been made to be inconsistent by the fault, in a case where the pair status immediately before the occurrence of the fault of the second pair in which the fault has occurred is the third type pair status; and determines that the data of the secondary logical volume of the second pair in which the fault has occurred has been made to be inconsistent, in a case where the pair status immediately before the occurrence of the fault of the second pair in which the fault has occurred is the first type pair status, the pair status of all pairs present between the second pair in which the fault has occurred and the primary logical volume of the first pair used for an application is in the first type pair status, and the application status of the primary logical volume used for the application is in the operation status.