Hitachi, Ltd.

Shinobu Kakihara

Mitsuhide Sato

Kenji Mori

To provide a storage subsystem in which, even when plural types of storage devices are provided, write processing from a cache memory to the plural types of storage devices is not delayed. Even when there are relative merits in writing performance of write data from the cache memory to the HDD and the SSD, the cache memoriesA,B with respect to the SSD having low writing performance are provided independently of the cache memoriesA,B with respect to the HDD.

Storage subsystem and storage system including storage subsystem

A disk array apparatus improves scalability, performance such as data transfer between different kinds of I/Fs, and maintainability and reliability about boards/PKs configuring the DKC and about a DKC configuration obtained by interconnecting them. The DKC in the disk array apparatus is configured by interconnecting mix PKs each including a base PK and a functional PK which is hierarchically connected to the base PK and on which individually separate functions are mounted. The base PK coexists with and is connectable to a plurality of different I/F-PKs, and includes an intra-package interconnection network for communicating between the functional PKs and with the DKC, and further has a processor interconnection network. The DKC performs a data transfer processing by using the functional PK and the base PK.

Disk array apparatus including control packages each having a base package and a functional package hierarchically connected to the base package

The storage control device of the present invention switch-connects each of enclosures and individually stops the transmission of power to the enclosures that are not being accessed in order to reduce the power consumption amount. A plurality of additional enclosures are switch-connected via an inter-device switch to a base enclosure. Drives that have not been accessed for a predetermined period of time or more undergo spindown. If all the drives in the enclosure then assume the spindown state, the supply of power to each of the drives from the intra-enclosure power supply is stopped. In cases where all the drives in a certain enclosure have undergone spindown, the base enclosure turns OFF the switch in the power distribution circuit connected to this enclosure. As a result, the transmission of power to this enclosure is stopped. The fault diagnosis section detects a fault that has occurred with communications that employ the inter-device switch and specifies the point of the fault occurrence.

Storage control device and enclosure-unit power control method

A storage system connected to a host device from which IO commands are sent comprises a plurality of load devices that act as loads including a plurality of storage devices, a current measuring unit that measures a current value flowing into the plurality of load devices, a power calculating unit that calculates at each time a power consumption value consumed by the plurality of load devices based on the measured current value, and a controller that receives an IO command from the host device, and accesses a storage device that follows the IO command out of the plurality of storage devices. The controller carries out power consumption control such that the calculated power consumption value is not more than a predetermined allowed power value and a difference between the power consumption value and the allowed power value is as small as possible.

Storage system and storage control method achieving both power saving and good performance

A disc array device receives a hardware diagnosis after shipment of the disc array device at short times during an operation of the device and a diagnostic rate is enhanced and an internal failure of a LSI can be detected at a device level. By at least one MP of a redundant-constitution channel interface control adaptor, a hardware diagnosis of a part in a channel interface control adaptor is made, and hardware diagnoses of a part in a CACHE and a part in a cache path switch are made through a diagnostic interface. By at least one MP of the redundant-constitutional disc drive interface control adaptor, a hardware diagnosis of a part in the disc drive interface control adaptor is made, and hardware diagnoses of a part in the CACHE and a part in the cache path switch are made through a diagnostic interface.

Growing community of inventors

Odawara, Japan

Shinobu Kakihara