Patent ID: 8700948

Claim:
A storage area managing apparatus for managing a plurality of storage drive groups each of which has a plurality of storage drives providing redundancy for each other, the storage area managing apparatus comprising: a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute: managing a plurality of logical volumes provided by the plurality of storage drive groups to store the data redundantly; generating recovery data, when at least one of the plurality of storage drive groups has at least one of the plurality of storage drives which is degraded, on the basis of the data stored in the at least one storage drive group having the at least one degraded storage drive; generating a selected logical volume from among the plurality of logical volumes provided by the plurality of storage drive groups on the basis of the capacity of the recovery data, the generating the selected logical volume including selecting one of the plurality of storage drive groups with a lowest utilization rate from among storage drive groups containing target logical volumes, by subtracting a capacity of storage drives in the selected storage drive group which have been allocated a logical volume, from the capacity of all storage drives in the selected storage drive group; managing first logical volumes selected from the plurality of storage drive groups excluding the at least one storage drive group having the at least one degraded storage drive; and first transferring the recovery data to the part of the plurality of storage drive groups as indicated by the selected logical volume.