Hitachi, Ltd.

Makio Mizuno

Katsuya Tanaka

Shuji Nakamura

Akira Fujibayashi

Kazuhisa Fujimoto

Kentaro Shimada

Masanori Takada

Dai Watanabe

Hirotoshi Akaike

Norio Shimozono

Sadahiro Sugimoto

Naoya Okada

Toshihiko Murakami

Midori Kurokawa

Ryosuke Matsubara

Akira Yamamoto

Takahiro Yamamoto

Tomohiro Kawaguchi

Hideo Saito

Yusuke Nonaka

Masakuni Agetsuma

Yoshinori Ohira

Tomohiro Yoshihara

Hiroto Ebara

Tetsuya Shirogane

Akihiko Araki

Kohei Tatara

Shintaro Kudo

Susumu Tsuruta

Norio Simozono

Shotaro Shintani

A distributed storage system includes one or a plurality of storage units including a plurality of physical storage devices, and a plurality of computers connected to the one or plurality of storage units via a communication network. When receiving a write request for a logical volume, the computer writes write data corresponding to the write request and redundant data for making the write data redundant in a plurality of physical storage devices of the storage unit in a distributed manner, and collectively controls writing of a journal of write data for managing a write history of the write data and a journal of redundant data for managing a write history of the redundant data.

Distributed storage system and storage control method

To provide stable processing performance and perform an appropriate failure processing in a storage device. A storage device includes a plurality of controllers; a plurality of storage drives; and a switch device including a plurality of controller-side ports respectively connected to the plurality of controllers and a plurality of drive-side ports respectively connected to the plurality of storage drives. The switch device performs address translations between the plurality of controller-side ports and the plurality of drive-side ports.

Storage device

It is detected whether write data has been correctly transmitted to a storage device under a protocol for directly connecting the storage device to a processor. An information processing system including: a processor; a memory; and a storage device, the processor first transmitting to the storage device, a command to invalidate data in a data area and which is designated by a write command, the storage device invalidating the data, the processor second transmitting to the storage device, the write command to write the data into the data area, and the storage device writing the data into the data area in accordance with the write command, validating the data in a data area into which the storage device has been successful in writing the data, and maintaining the data invalidated in a data area into which the storage device has failed in writing the data.

Information processing system and storage device control method to determine whether data has been correctly written into a storage device

Computer components, such as processors and storage devices, provide a performance and consumes an electric power within a range of an upper limit performance and an upper limit power consumption of a power state set for the component among a plurality of power states corresponding to a type of the component. A processor unit determines whether a budget power as a power consumption permitted for a target computer is equal to or more than a power consumption of the target computer or not. When the determination result is false, for at least one component of the target computer, the processor unit selects a power state based on at least one of a priority of an operation using the component and a data characteristic corresponding to the component among a plurality of types of power states corresponding to a type of the component as power state of the component.

Computer system and electric power control method for computer system

Provided is a storage system that includes a plurality of storage devices; a controller that controls the storage device including a processor and a memory; and a data transfer path connecting each of the storage devices to the controller. The storage device is divided into a plurality of groups. The controller specifies the storage device belonging to each of the plurality of groups among the plurality of storage devices connected via the plurality of independent data transfer paths, receives an access request to specify the storage device to be accessed, and designates the different data transfer paths for each group of the specified storage devices. The storage device performs data transfer by a connection-less protocol according to the designated data transfer path.

Storage system and storage control method

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 subsystem comprises one or more volumes, and multiple nodes having multiple control packages interconnected via an intra-node communication path, wherein the control packages of different nodes are interconnected via an inter-node communication path having a lower transmission path capacity than the intra-node communication path. When the host computer accesses a volume, access is enabled via any of at least two or more control packages out of the multiple control packages, and the priority for issuing access requests to the relevant volume is determined in each of the control packages. When the storage subsystem detects failure, it changes the priorities determined for the control packages according to the failure occurrence portion, and notifies the same to the host computer. The host computer determines the control package being the issue destination of the access request based on the notified priority.

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 storage controller has a processor, a volatile first cache memory that is coupled to the processor and that temporarily stores data, a nonvolatile second cache memory that is coupled to a microprocessor and that temporarily stores data, and a battery that is configured to supply electrical power to at least the processor and the first cache memory when a power stoppage has occurred. The second cache memory includes a dirty data area for storing dirty data, which is data that is not stored in the storage device, and a remaining area other than the dirty data area. When a power stoppage has occurred, the processor stores as target data in the remaining area of the second cache memory either all or a part of the data stored in the first cache memory.

Storage system

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

A storage systemincludes a storage apparatusand a storage controllerconfigured to control the storage apparatus. The storage controller adds a predetermined flagto every predetermined size of data requested by a host computer to be written to the storage system, and stores the resultant data in a cache memoryC. Upon detecting a predetermined trigger for saving, the storage controller stores, in a nonvolatile memory, data with the flag added thereto out of the data stored in the cache memory. The storage controller detects, as unsaved data information, a data size and a storage location for data with no flag added thereto out of the data on the cache memory, and stores the detected unsaved data information in the nonvolatile memory in association with the data with the flag added thereto.

Electronic storage system utilizing a predetermined flag for subsequent processing of each predetermined portion of data requested to be stored in the storage 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

According to the prior art, when requesters having different I/O access processing abilities compete when accessing a target, latency is extended via accesses from a requester having a lower I/O access performance, according to which the number of I/Os issued per unit time (data processing quantity) cannot be increased, and the processing performance of the system cannot be improved. According to the present invention, when requesters compete in accessing a target, the request having a lower requester performance (having a longer processing time per single I/O) is processed (started) in a prioritized manner. Thereby, the number of I/O processes per unit time can be increased, and the processing performance of the whole storage system can be improved.

Storage system and access arbitration method

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.

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Sagamihara, Japan

Makio Mizuno