Patent ID: 7184378
Filing Date: 2007-02-27
Classification: G06F

Abstract:
1. In a storage system including a first storage device control device that is communicably connected to a first information processing device, receives a first data write or read request transmitted from the first information processing device and conducts data writing or reading with respect to first storage devices in response to the request, a second storage device control device that is communicably connected to the first storage device control device, receives a second data write or read request transmitted from the first disk control device and conducts data writing or reading with respect to second storage devices in response to the request, and a second information processing device communicably connected to the first and second storage device control devices, wherein the first storage device control device includes a first logical unit management table managing unit that stores a first logical unit management table in which is registered identification information of first logical units that are units identifying storage regions of the first storage devices, the second storage device control device includes a second logical unit management table managing unit that stores a second logical unit management table in which is registered identification information of second logical units that are units identifying storage regions of the second storage devices, the first storage device control device includes a mapping management table managing unit that stores a mapping management table in which is registered correspondences between the first logical units and the second logical units and which the first storage device control device references when the first storage device control device receives the first data write or read request and determines whether the storage regions identified by the first logical units set in the request are the storage regions of the first storage devices or the storage regions of the second storage devices, the second storage device control device includes a logical unit information transmitting unit that transmits, to the second information processing device, logical unit information including all or some of the identification information of the second logical units registered in the second logical unit management table, the first storage device control device includes a mapping information transmitting unit that transmits, to the second information processing device, mapping information that is all or some of the mapping management table, the second information processing device includes a logical unit information receiving unit that receives the logical unit information, the second information processing device includes a mapping information receiving unit that receives the mapping information, and the second information processing device includes a mapping status information generating unit that references the received logical unit information and the mapping information to generate mapping status information that is information representing whether the second logical units are corresponded to the first logical units, a storage device control device including the functions of the first storage device control device.