Hitachi, Ltd.

Tomohisa Ogasawara

Yukiyoshi Takamura

Yuji Hata

Hidechika Nakanishi

Yuki Kotake

Toru Ando

Yusuke Matsumura

Ryoma Ishizaka

In a first system among first and second systems being a duplexed system as a path to a storage device, in a first SAS expander including a first port directly coupled to a storage device, buffer-on signifying that buffering is to be performed by the first SAS expander is configured with respect to the first port. In the second system, in a second SAS expander including a second port directly coupled to the same storage device, buffer-off signifying that buffering is not to be performed by the second SAS expander is configured with respect to the second port. By selecting any of the first system and the second system as a path of a command, whether or not the command is to be buffered by the first or second SAS expander directly coupled to a storage device serving as a destination of the command is determined.

Storage system and method for controlling command transmission

A storage subsystem capable of satisfying conditions such as storage capacity and access performance requested by users and to enable expansion of storage drives that are not in RAID group (RG) units is provided at a low cost. The storage subsystem includes a first storage drive for storing data sent from a host computer, a second storage drive having a property that differs from the first storage drive for storing data sent from the host computer, and a processor for controlling the first storage drive and the second storage drive, wherein a processor receives RG configuration requirements from the host computer and determines whether an RG satisfying the RG configuration requirements can be configured, and if the processor determines that an RG can be configured, the first storage drive and the second storage drive are combined to configure the RG.

Storage device and method for configuring raid group

A storage apparatus and program update method for reducing tediousness and complications of drive inventory management. A storage apparatusincludes a disk unitcomposed of a plurality of first drivesstoring first firmware of the same type, a controllerfor controlling data during operation of the first firmware, a relay device, and a second drive. Then, the second drivestores second firmware of the same type as that of the first firmware and third firmware of a type different from that of the first firmware. The controllerincludes: a firmware comparison unit for comparing the first firmware with the second firmware; a firmware comparison unit for deciding firmware to operate on the storage apparatusbased on the comparison result; and a firmware update unit for updating the firmware operating on the first driveor the second drivewith the decided firmware.

Storage apparatus and program update method

To provide a storage control device capable of changing the rotation speed of storage devices. A plurality of hard disk drivesis mounted in the device mounting unit. The rotation speed control unitdetects the mounting location of each hard disk drive, and determines the rotation speed in accordance with the location of each hard disk drive. The rotation speeds of adjacent hard disk drivesare different from each other. The rotation speed control unitchanges the rotation speed of each hard disk driveto the determined rotation speed.

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Tokyo, Japan

Tomohisa Ogasawara