Hitachi, Ltd.

Tomohiro Nishimoto

Takaki Matsushita

Toshiya Seki

Takashi Kaga

Natsuki Kusuno

To prevent an excessive increase of a dirty data amount in a cache memory. A processor acquires storage device information from each of storage devices. When receiving a write request to a first storage device group from a higher-level apparatus, the processor determines whether a write destination cache area corresponding to a write destination address indicated by the write request is reserved. When determining that the write destination cache area is not reserved, the processor performs, on the basis of the storage device information and cache information, reservation determination for determining whether to reserve the write destination cache area. When determining to reserve the write destination cache area, the processor reserves the write destination cache area. When determining not to reserve the write destination cache area, the processor stands by for the reservation of the write destination cache area.

Storage apparatus, recording medium, and storage control method

In a storage device according to the present invention, controllers each having a cache memory manage duplication of cache data. A storage device SD includes multiple controllerseach including a cache memory, and multiple storing unitsused by the controllers and configured with logical volumefor being provided to a higher-level device. Each of the controllers, in a case where a paired destination controller forming a duplication pair is blocked, selects a new paired destination controller for each logical volume, forwards the cache data stored in the cache memory included in the own controller to the new paired destination controller, and stores the cache data in a cache memory included in the new paired destination controller to duplicate the cache data.

Storage device, controlling method of storage device, and storage device controller having predetermined management information including face attribute information, a controller number, and transition method information

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Tokyo, Japan

Tomohiro Nishimoto