Patent ID: 7996612
Filing Date: 2011-08-09
Classification: G06F,Y02D

Abstract:
1. A computer system, comprising: a computer; and a storage system coupled to the computer through a network, wherein: the computer has an interface, which is coupled to the network, a processor, which is coupled to the interface, and a memory, which is coupled to the processor; the storage system has a plurality of disk drives and a controller, which controls the plurality of disk drives; the plurality of disk drives provide a data storage area that is partitioned into a plurality of logical volumes; the plurality of logical volumes include a first number of first logical volumes and as many second logical volumes as the first number; each of the plurality of logical volumes belongs to one of a plurality of volume sets; the plurality of volume sets include a first volume set to which the first number of the first logical volumes belong and a second volume set to which the first number of the second logical volumes belong; the first number of the first logical volumes are allocated dispersedly to a second number of the disk drives; the first number of second logical volumes are allocated dispersedly to a third number of the disk drives, the third number being larger than the second number; and the computer holds management information which associates each of the first logical volumes and each of the second logical volumes with each other, and is configured to: