Hitachi, Ltd.

Nippon Telegraph and Telephone Corporation

Ntt Electronics Corporation

Hitachi Vantara Corporation

Katsuya Tanaka

Kentaro Shimada

Shuji Nakamura

Makio Mizuno

Akira Yamamoto

Masanori Takada

Hirotoshi Akaike

Takeshi Kato

Tetsuya Shirogane

Tetsuya Uemura

Kazuhisa Fujimoto

Hideaki Fukuda

Sadahiro Sugimoto

Yutaro Kobayashi

Masanori Nakamura

Tatsuya Saito

Norio Shimozono

Hiroki Yamashita

Naoya Okada

Masahiro Suzuki

Masayoshi Yagyu

Kenichi Mizuishi

Hiroto Kawakami

Kohei Tatara

Shintaro Kudo

Tomoyoshi Kataoka

Asuka Matsushita

Fumio Yuuki

Akihiro Yamagishi

Masahiro Tachibana

Mikio Yoneyama

Akihiko Matsuura

Manabu Ishida

Teruhisa Shimizu

Eisuke Tsuchiya

Atsushi Hoki

Yuya Oyama

Tomohisa Iwanaga

Yoshikazu Murayama

In a storage device including a plurality of controllers for controlling data reading and writing operations with respect to at least one host computer, each of the controllers includes: a cache region to which a plurality of management units capable of temporarily storing the data are allocated in accordance with the data reading and writing operations; and a control unit for controlling the data reading and writing operations, and when an error occurs, the control unit determines whether or not an occurrence position of the error is in the cache region, and when it is determined that the occurrence position is in the cache region, the control unit excludes, among the plural management units, a specific management unit that contains the occurrence position from an allocation target in the cache region, to control the data reading and writing operations using remaining management units in the plural management units.

Storage device and a method of error processing thereof

A storage apparatus includes a plurality of storage controllers. Each of the plurality of storage controllers includes a controller interface for connecting the storage controllers. The controller interface includes one or more logical ports corresponding to each storage controller of the connection destination. When converting the first request of the first protocol used in the storage controller into the second request of the second protocol used in the inter-storage controller network, the controller interface stores the identification information of the first request and the identification information of the second request in the send queue of the logical port.

Storage device and protocol conversion method by storage device

A frontend interface of a controller according to the present invention includes a plurality of corresponding queueing interfaces for each processor of the controller, and an enqueueing destination of a host I/O command can be switched in response to an instruction from a processor. When a controller OS restarts, the controller waits for completion of a host I/O and executes controller blocking and restarting during setup. Therefore, to determine whether or not this process is possible, the processor gives an instruction to switch a queue and waits until a switch source queue is empty.

Storage apparatus and method of controlling storage controller

Each storage controller comprises a first storage unit, an interface unit, and a processing unit which sends, to the interface unit, a parameter which instructs n-fold write of writing data in each of n-number of (n is a natural number of 2 or more) other storage controllers. When the interface unit receives the parameter, the interface unit executes each processing of acquiring the data from the first storage unit and storing the data in the second storage unit, generating n-number of requests of writing the data in each of n-number of the other storage controllers, storing each of the generated requests in n-number of the queues corresponding to each of n-number of the other storage controllers, and processing each request stored in each queue and transferring the data stored in the second storage unit to each of n-number of the other storage controllers.

Storage system, data write control method, and non-transitory computer readable medium for storing data write control program

Part of compensation of the transmission characteristics of the optical transmitter is performed by transmitter compensation circuitry disposed at a stage prior to the optical transmitter. Remaining part of compensation of the transmission characteristics of the optical transmitter and compensation of the transmission characteristics of the optical receiver is performed by a receiver compensation circuitry disposed at a stage subsequent to the optical receiver. Transmitter compensation characteristics of the transmitter compensation circuitry is set so that a peak-to-average-power ratio of an output signal from the transmitter compensation circuitry becomes equal to or smaller than a predetermined value.

Optical transmission characteristics compensating method and optical transmission characteristics compensating system

A storage system includes a plurality of storage controllers and a drive box including one or more non-volatile storage devices. The drive box includes a memory on which reading and writing are performed in a unit different from a unit for reading and writing the one or more non-volatile storage devices, and which stores control information to be used by the plurality of storage controllers, and a memory controller that enables each storage controller of the plurality of storage controllers to exclusively read and write the control information of the memory by arbitrating accesses to the memory from the plurality of storage controllers.

Storage system including a memory controller that enables each storage controller of a plurality of storage controllers to exclusively read and write control information of the memory

A storage apparatus in which a controller reads out a port status of a switch in a short period of time is disclosed. The storage apparatus includes a switch and a plurality of storage controllers configured to communicate with each other through the switch. The switch includes a switch processor, a plurality of data ports, a switch integrated circuit, a memory, and a management interface. One of the plurality of data ports and a management port of the management interface are connected to each other. The switch processor stores a status of the plurality of data ports acquired from the switch integrated circuit into the memory. The plurality of storage controllers access the management interface through the plurality of data ports and the management port and receive the statuses of the plurality of data ports stored in the memory from the management interface.

Storage apparatus

A first storage controller includes a first processor, a first memory, and a first switch having a first port. A second storage controller includes a second processor, a second memory, and a second switch having a second port. A storage system connects the first port and the second port by a first link. The first processor and the first switch are connected by a second link configured to transfer user data and a third link configured to transfer control data. The second processor and the second switch are connected by a fourth link configured to transfer user data and a fifth link configured to transfer control data. The first port and the second port transfer the control data in preference to the user data on the first link.

Storage system

Efficient communication between storage controllers can be performed. A storage system includes one or more backend switches that connect a first processor, a second processor, and one or more storage devices to each other. Each backend switch identifies a destination of a frame by referring to the frame received from the first processor. In a case where the destination of the frame is the second processor, each backend switch translates a first address, included in the frame, for specifying a location on the second memory in an address space of the first processor, into a second address for specifying the location on the second memory in an address space of the second processor, and transfers the frame including the second address to the second storage controller.

A storage device according to an embodiment of the present invention has a plurality of storage nodes, each of which has a plurality of logical ports having send and receive queues for a communication request and an identification number, and an internal network for connecting the plurality of storage nodes with one another. The storage nodes each have, as the logical ports, a data communication logical port used for data communication with other storage nodes and an error communication logical port used to notify the other storage nodes of a state of the data communication logical port. When detecting an occurrence of transition of the data communication logical port to an error state, the storage node uses the error communication logical port to notify the other storage nodes of the identification number and the state of the data communication logical port.

Storage device having error communication logical ports

A storage system includes a plurality of controllers each including a processor module and a memory, and a relay unit to relay a communication between the processor modules. The relay unit executes assignment determination to determine one of the processor module of a first controller and the processor module of a second controller is a processor module processing a command stored in the memory. The first controller includes memory storing the command, and the second controller is any of the controllers other than the first controller. When the relay unit determines the command of the processor module of the first controller, the relay unit notifies storage location information of the command to the processor module of the first controller, and when the relay unit determines the command to be processed by the processor module of the second controller, the relay unit transfer the command to the second controller.

Storage system, storage control method, and relay device

A light modulation device detects a power of the modulated optical signal modulated by each of an I-component optical modulator and a Q-component optical modulator, synchronously-detects a component of a frequency fd from the power of the modulated optical signal, outputs a dither signal of a frequency fd/n (where n is a positive integer equal to or larger than 1) applied to a first bias voltage or a second bias voltage when adjusting the first bias voltage or the second bias voltage, outputs two dither signals having a frequency fd/m (where m is a positive integer equal to or larger than 1, where n&#x3c;m), which are mutually orthogonal to each other, applied to the first and second bias voltages when adjusting a third bias voltage, and adjusting bias voltages by increasing or decreasing bias voltages based on a synchronous detection result.

Light modulation device and light modulation method

In a storage subsystem adopting HDD and PCIe-SSD as storage media, as a method for preventing the complication of having to select a removal method while considering the drive type inserted to the drive slot since the method for removing the HDD differs from the method for removing the PCIe-SSD according to the prior art, the present invention provides an LED for displaying whether it is possible to remove the HDD or the PCIe-SSD inserted to the slot of a drive enclosure, wherein when an HDD is inserted in the drive slot, the LED displays that removal of the HDD is enabled when power supply to the HDD is stopped, and when PCIe-SSD is inserted to the drive slot, the LED displays that removal of the SSD is enabled when Downstream Port Containment (DPC) is triggered in the downstream port of the PCIe switch to which the SSD is connected.

Storage device employing PCI-express connection solid-state drive

In a storage device applying PCIe to a back-end network connection, in order to be capable of allocating bus numbers and making a PCIe switch expanded afterwards usable, it is necessary to once reset all PCIe switches. To dissolve this necessity, PCIe switches of the back-end network of the storage device are connected in series, a range of continuous bus numbers that are managed and stored in bus number management table is allocated for the back-end network connection, and when expanding the PCIe switch, the bus numbers are allocated in ascending order from a minimum value of the allocatable bus numbers to each of a link between the PCIe switches and to a virtual PCI bus within the PCIe switch, and the bus numbers are allocated in descending order from a maximum value of the allocatable bus numbers to the link between the PCIe switch and a drive.

Information system capable of expanding drive and bus number allocation method of the information system

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Kokubunji, Japan

Katsuya Tanaka