Hitachi, Ltd.

Other

Hiroki Kanai

Kazuhisa Fujimoto

Akira Fujibayashi

Yoshifumi Takamoto

Seiji Kaneko

Nobuyuki Minowa

Atsushi Tanaka

Junichi Iida

Wataru Sakurai

Keishi Tamura

Yoshimasa Masuoka

Katsuyoshi Kitai

Shoji Kato

Tadahiro Takase

Yuusuke Yauchi

Mitsuo Ooyama

Ryosuke Matsubara

Hikari Mikami

Makoto Asari

Akira Yoshida

Shuji Nakamura

Toru Maeda

Yoshihisa Kamo

Hitoshi Kakuta

Yasuo Inoue

Akiyoshi Hashimoto

Toyohiko Kagimasa

Aki Tomita

Tatsumi Uchigiri

Akihiko Ohba

Shohei Shimahara

Mitsuo Ohyama

A storage system which is connected to a host computer, includes a storage device; a first controller which controls data transfers between the storage device and the host computer; a second controller connected to the first controller and controls data transfers between the storage device and the host computer; a non-volatile memory; and a battery device. The first controller includes a first volatile memory and the second controller comprising a second volatile memory. Upon a power outage, the battery device starts supplying electric power to the first controller and the second controller, and wherein the second controller copies data which is stored in the first volatile memory to the second volatile memory and, after copying is complete, stops operation of the first controller, stops the power supply from the battery device to the first controller, and copies data.

Reducing required battery capacity for data backup in a storage system with multiple controllers

At the time of a fan failure of a plurality of fans for cooling redundant controllers, data loss can be avoided even if a power source of each controller is controlled. A storage system includes: a first controller for controlling a first power source; a plurality of first fans for cooling the first controller; a second controller for controlling a second power source; a plurality of second fans for cooling the second controller; and a storage device including a plurality of storage units; wherein if a fan failure of the first fans occurs, the first controller controls the first power source in a standby state on condition that the second controller is in a normal state; and if the second power source is in the standby state, the first controller executes destaging processing and then controls the first power source in the standby state.

Storage system and its control method

When there is an access passing between unit disk controllers, the band of a mutual connecting network must be very large in order to exhibit the performance sufficiently, so that the cost is increased. In the present invention, the access number of a logical volume is monitored, the change of an access path is suggested to an upper class device, and the logical volume is moved or copied to each unit disk controller, so that the mutual connecting network is used mainly for copy of the logical volume, thereby reducing the necessary band.

Computer system using disk controller and operating service thereof

Reliability of data that is stored in a disk drive by a storage system is enhanced. An information apparatus has a processor, a memory, an interface control unit, and a system control unit, which controls communications between the processor, the memory, and the interface control unit. The system control unit judges whether to attach, to data that is transferred between the memory and the system control unit, an error detecting code for protecting the data based on an address in the memory at which the data to be transferred is read or written.

Method and information apparatus for improving data reliability

A first storage control system comprises a CHN connected to a LAN CN. The CHN comprises a NAS processor and I/O processor. The I/O processor judges whether all or a portion of block level data is to be stored in either a first storage control system or a second storage control system, on the basis of an I/O allocation control data which indicates which of either the first storage control system or the second storage control system the block level data is to be stored in. On the basis of the result of this judgment, the I/O processor transfers the block level data from the NAS processor, to at least one of the DKA and the CHF connected to the second storage control system.

Storage control system and method having first and second channel control sections which convert file level data to block level data, judge whether block level data is to be stored in external storage and identifies save destination address of file level data based on metadata

A storage device control apparatus includes a mounting part and an internal connection part. The mounting part can removably mount channel control unit, each with a host interface controller formed therein for receiving data I/O requests, disk control units, each with a disk interface controller formed therein for performing I/O control of the data to storage volumes storing data in response to the data I/O requests, cache memory units, each with a memory formed therein for storing the data, and storage control units, each with the host interface controller, the disk interface controller, and the memory formed therein. The internal connection part connects the channel control units, the disk control units, the cache memory units, and the storage control units in a communicable manner.

Storage device control apparatus and control method for the storage device control apparatus

Provided is a storage controller capable of changing a system configuration with scalability. A storage controller blade of the storage controller includes: interface units that each connect to one of a host computer and a disk device; a processor unit that controls a configuration of the storage controller and data access; a memory unit that stores a data cache and configuration information on the interface unit and the processor unit; and a mutual connection unit that connects the interface units, the processor unit, and the memory unit to one another. The processor unit recognizes a form of connection to another storage controller blade over the mutual network, and the connection path to another storage controller blade is set in the mutual connection unit based on the recognized form of connection.

Storage controlling unit

The enclosurein which the storage control systemis constructed comprises a scale-out NAS head groupconstituted by two or more NAS heads, and a scale-up NAS headH that is a higher performance NAS head than each of NAS head membersL that are the NAS heads constituting the scale-out NAS group. The enclosurepermits insertion into general-purpose slotsin which the NAS head membersL and another type of channel control unitthat differs from the NAS head membersL are inserted. The scale-up NAS headH is mounted within the enclosurein a different location from the general-purpose slots

Storage control system

A disk array device is equipped with a plurality of input/output channels that receive data input/output requests from an external device, a plurality of cache memories provided for the corresponding respective input/output channels, each of the cache memories connected to each of the corresponding respective input/output channels, a disk drive device, a disk control module that performs data input/output to and from the disk drive device, and a communication module that communicatively connects the input/output channels with the disk control module. The disk array device also includes a consistency maintaining module that can perform a consistency maintaining processing to maintain consistency of data stored in each of the cache memories. According to the content of the data input/output request received from the external device, an execution order of a response processing to respond to the external device according to the data input/output request and the consistency maintaining processing is controlled.

Disk array device, method for controlling the disk array device and storage system

In a storage system having a first storage control apparatus and a second storage control apparatus, the first storage control apparatus has: a first memory; a second memory; an input/output control unit for data transfer information in the second memory; and a data transfer control unit having a data buffer and a data transfer register for controlling data transfer between the first memory and second storage control apparatus based on the data transfer information read from the second memory and written in the data transfer register. When a second data transfer is controlled while a first data transfer is controlled, the data transfer control unit writes the first data transfer information and data stored in the data buffer into the second memory, reads the second data transfer information from the second memory and writes the second data transfer information into the data transfer register to control the second data transfer.

Storage control apparatus and method thereof

A storage control apparatus comprising a plurality of channel control units each having an interface with an information processor; a disk control unit having an interface with a storage device for storing data; a cache memory for storing temporarily data to be interchanged between the information processor and the storage device; and an internal connector unit for connecting mutually the plurality of channel control units and the disk control unit, wherein the cache memory is disposed in each of the plurality of channel control units that are connected to one another through a dedicated data transfer path used for storing mutually the data stored in the cache memories.

Storage control apparatus, storage system, control method of storage control apparatus, channel control unit and program

Storage control system and method which converts file level data into block level data which is stored at different destinations based on metadata of files being managed

A storage device controller has a channel controller; a disk controller; and a first memory for storing data delivered between the channel controller and the disk controller. The channel controller has a circuit board on which a first processor, a file access processor having a second processor and a second memory, a data transfer device and a third memory are formed. The second processor transmits information indicating the storage position of data in the second memory to the first processor, the first processor writes into the third memory data transfer information containing information indicating the storage position of data in the first memory and information indicating the storage position of the data in second memory, and the data transfer device reads out data transfer information from the third memory and controls the data transfer between the first memory and the second memory on the basis of data transfer information thus read out.

Growing community of inventors

Odawara, Japan

Hiroki Kanai