Hitachi, Ltd.

Tatuya Ninomiya

Yasuo Inoue

Hidefumi Masuzaki

Hidehiko Iwasaki

Naoya Takahashi

Soichi Isono

Hiroyuki Kurosawa

Masayuki Hoshino

A storage system, coupled to a host computer, including at least one controller receiving data from the host computer, and a plurality of memory units connected to the controller. The controller generates parity data and sends the data and the parity data to the memory units. The memory units include a semiconductor memory device which stores the data and the parity data permanently.

Storage system having a semiconductor memory device which stores data and parity data permanently

A storage system to be connected to a large-scale computer includes a plurality of host adaptors connected to a host device, a plurality of storage device for storing data from the host device, a plurality of disk adaptors connected to the storage devices, a plurality of caches for temporarily storing data transferred between the host adaptors and the disk adaptors, and two buses connected to the host disk adaptors, and the caches. The buses transfer data among the host and disk adaptors and the caches.

Storage system having data format conversion function

Storage system

A storage system to be connected to a large-scale computer includes a plurality of first logical units connected to a host device, a plurality of second logical units connected to a storage device, a plurality of cache memories, and a common bus wired between these logical units and memories. The plurality of first logical units, the plurality of second logical units, and the plurality of cache memories are all made in the form of modules. The modules are detachably mounted to the common bus disposed on a back plane. The storage device can be made up of a plurality of small-size storage units arranged in an array. Thus, the storage system realizes its scalability. Since the plurality of first logical units, the plurality of second logical units, and the plurality of cache memories are duplexed and the common bus is made in the form of 2 channels, the storage system can perform degrade operation. Since plurality of first logical units, the plurality of second logical units, and the plurality of cache memories allow hot replace, the storage system can realize its non-stop maintenance.

Storage system having plural buses

Storage system realizing scalability and fault tolerance

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Odawara, Japan

Tatuya Ninomiya