Patent ID: 9043571
Filing Date: 2015-05-26
Classification: G06F

Abstract:
1. A management apparatus in a computer system which includes a plurality of storage areas provided by each of a plurality of mutually coupled storage apparatuses as a logical pool across the plurality of storage apparatuses, provides to a host computer a virtual volume associated with the logical pool, and assigns one or more storage areas from the logical pool to the virtual volume when the host computer writes data into the virtual volume, where the host computer is coupled to the plurality of storage apparatuses via a plurality of access paths, the management apparatus comprising: a processor; and a memory storing instructions that, when executed by the processor, instruct the processor to: select one of the access paths from among the plurality of access paths which the host computer uses to access the virtual volume; control the one of the storage apparatuses coupled to the selected access path to transfer, when an I/O request from the host computer received via the selected access path is for data not respectively stored therein, the I/O request to one of the storage apparatuses storing the data of the I/O request; and when another storage apparatus is added to the plurality of storage apparatuses, switch the selected access path to an access path to the added storage apparatus so that the host computer accesses the virtual volume via the access path to the added storage apparatus.