Patent ID: 7698503
Filing Date: 2010-04-13
Classification: G06F

Abstract:
1. A computer system comprising: at least one host computer, a storage system for storing data used by the host computer, and a managing computer for managing storing the data in the storage system which are connected to each other through a network, wherein the storage system includes a plurality of disk drives configuring a plurality of parity groups in which a plurality of logical volumes are formed, and a processing part for receiving data sent from the host computer, wherein the logical volumes include at least a data volume for storing data sent from the host computer, a snapshot volume for storing a snapshot which is a data image of the data volume at a certain timing, and a plurality of journal volumes, correspondingly assigned to the data volume, for storing the received data as a journal, the journal volumes being classified into a plurality of groups of journal volumes, wherein the processing part recovers the data in the data volume at the certain timing by applying the journal to the snapshot, wherein first journal volumes in the journal volumes are classified in a first group in the groups of journal volumes and allocated to a first parity group in the parity groups, the first parity group stores destinations of journals of the first journal volumes, wherein the managing computer monitors the journal volumes when the managing computer detects that the storing destination of one of the first journal volumes which is classified in the first group changes from the first parity group to a second parity group which is different from the first parity group, transmits an instruction that the storing destination of the other first journal volumes which is classified in the first group is changed from the first parity group to the second parity group, and wherein the processing part of the storage system changes the storing designation of the other first journal volumes from the first parity group to the second parity group and stops power supply to the first parity group in response to the instruction from the managing computer.