Hitachi, Ltd.

Hirotoshi Akaike

Norio Shimozono

Katsuya Tanaka

Koji Hosogi

Nobuhiro Yokoi

Kazuhisa Fujimoto

Sadahiro Sugimoto

Makio Mizuno

Akira Yamamoto

Ryosuke Tatsumi

Kazushi Nakagawa

Naoto Matsunami

Shuji Nakamura

Kentaro Shimada

Kohei Tatara

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 storage system for continuing I/O without affecting drive box addition to a host computer includes: a plurality of drive boxes for connecting to a computer device that transmits commands for data reads or writes; and a storage controller connected to the drive boxes. A first drive box provides a first storage region to the computer device. The storage controller manages correspondence between the first storage region and a physical storage region of the drives constituting the first storage region. The first drive box receives a command for the first storage region from the computer device and transfers the command to the storage controller. The storage controller generates a data transfer command including a data storage destination based on the address management table, and transfers the command to the first drive box. The first drive box then transfers the data transfer command to the second drive box.

Drive box, storage system and data transfer method

A storage system includes at least one drive chassis connected to at least one host computer via a first network, and a storage controller connected to the drive chassis, in which the storage controller instructs the drive chassis to create a logical volume, and the drive chassis creates a logical volume according to an instruction from the storage controller, provides a storage area of the storage system to the host computer, and receives an IO command from the host computer to the storage area of the storage system.

Storage system and data transfer method

A memory stores: a communication driver that is a software program which runs in an operating system and communicates with a host; and a storage service program that is a software program which runs on the operating system and controls retention of data by a storage apparatus as a storage. The processor is capable of configuring a plurality of queue pairs which transmit information in inter-process communication between the communication driver and the storage service program, and the processor further configures command distribution information which associates a queue pair and a logical volume with each other, specifies a queue pair corresponding to a logical volume that is an access destination of a command requested by the host, and enqueues a command request of the command to the specified queue pair.

Computer, communication driver, and communication control method

The processor provides a host computer with a logical volume based on a physical storage device. Based on a command from the host computer, the control device writes, into a memory, address information that associates a logical address in the logical volume with a device address in the physical storage device. The control device receives a command from the host computer and if it is determined that the command is a read command, identifies a first logical address designated by the command and determines whether or not the first logical address is included in the address information. If the first address is included in the address information, the control device specifies a first device address corresponding to the first logical address, reads read data stored in an area indicated by the first device address, and transmits the read data to the host computer.

Storage apparatus, computer system, and method for improved read operation handling

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

The present invention provides a storage subsystem capable of realizing a backend network enabling SSDs arranged in a small number of rows to be shared among controllers, and capable of having a large number of HDDs loaded thereto, according to which the performance of the storage is enhanced. In a topology of the backend network, the respective controllersandand the enclosure expanders are respectively connected via top expandersand, the top expandersandare connected via a central expander, expandersandfor connecting SSDs to the top expanderare mutually connected in parallel, expandersandfor connecting SSDs to the top expanderare mutually connected in parallel, expandersandfor connecting HDDs to the top expanderare connected in series, and expandersandfor connecting HDDs to the top expanderare connected in series.

Storage subsystem

Data transfer between storage apparatuses is reduced, and performance of data access of a storage system is improved. In a case where a processor of a first storage apparatus receives a write request from a host computer as a request for data access to a virtual volume and a cache memory of any of the storage apparatuses is not allocated to a virtual storage area in the virtual volume designated by the data access request, the processor of the first storage apparatus selects a second storage apparatus and a third storage apparatus among candidates satisfying a predetermined state condition among the storage apparatuses based on connection information indicating connection between the storage apparatuses through a communication line.

Storage system and storage system control method

A computing system includes a plurality of computing units, a tiered storage unit including a first storage medium and a second storage medium having a transfer rate lower than that of the first storage medium, and connected to a plurality of the computing units; and a system management unit connected to a plurality of the computing units and the tiered storage unit. The system management unit creates a computation job execution schedule for a plurality of the computing units or obtains the computation job execution schedule from other unit in the computing system, plans a data migration in the tiered storage unit according to the execution schedule using a predetermined method, and instructs the tiered storage unit to migrate a data based on the plan.

Computing system, method of controlling the same, and system management unit which plan a data migration according to a computation job execution schedule

A storage system includes a file server connected with a plurality of computers, and a second storage device connected with a first storage device, in which the second storage device has a second volume; the first storage device has a virtual volume virtualized with a first volume and the second volume as a self-device possessed volume; and the file server mounts the first volume as a first directory, mounts the virtual volume as a second directory, and copies predetermined files in the second directory into the first directory.

Growing community of inventors

Tokyo, Japan

Hirotoshi Akaike