Hitachi, Ltd.

Hitachi Vantara Corporation

Masahiro Tsuruya

Tomohiro Yoshihara

Akifumi Suzuki

Kentaro Shimada

Nagamasa Mizushima

Masahiro Arai

Hideyuki Koseki

Ryosuke Tatsumi

Takashi Nagao

Shimpei Nomura

Shinsuke Izawa

Atsushi Kawamura

Norio Shimozono

Naoya Okada

Yoshihiro Yoshii

Koji Hosogi

Nobuhiro Yokoi

Osamu Kawaguchi

Jun Miyashita

Ryo Hanafusa

Mitsuo Date

A storage system includes a controller and one or more storage devices, and the controller can compress data in different compression units, and collectively compresses data of one or a plurality of consecutive addresses in each compression unit of the different compression units. The controller receives write data, determines whether read of data stored in the one or more storage devices is necessary for compression of the write data by a first compression unit, determines compression of the write data in the first compression unit when read is not necessary, and determines compression in the first compression unit or compression in a second compression unit smaller than the first compression unit based on a remaining endurance of rewriting of the one or more storage devices when read is necessary.

Storage system

A storage device includes a processor and an accelerator configured to compress and decompress data. The processor receives first replacement write data for a part of a first logical address region to update first data in the first logical address region that has been compressed by basic compression unit. The processor instructs the accelerator to compress the first replacement write data by a size smaller than the basic compression unit. The accelerator compresses the first replacement write data by the smaller size. The processor merges not-to-be-replaced data in the first logical address region and the first replacement data that are decompressed by the accelerator to generate uncompressed data having a size of the basic compression unit. The processor instructs the accelerator to compress the uncompressed data by the basic compression unit.

Storage device

The storage device includes a first memory, a process device that stores data in the first memory and reads the data from the first memory, and an accelerator that includes a second memory different from the first memory. The accelerator stores compressed data stored in one or more storage drives storing data, in the second memory, decompresses the compressed data stored in the second memory to generate plaintext data, extracts data designated in the process device from the plaintext data, and transmits the extracted designated data to the first memory.

A protocol chip writes a request from a host apparatus to a shared memory. One of the plurality of processors reads the request from the host apparatus from the shared memory through an address translation unit and writes a response to the request to the shared memory through the address translation unit. The protocol chip reads the response from the shared memory and sends the response to the host apparatus. In the case where a first processor reboots, the first processor performs a reboot process of a first address translation unit but does not perform the reboot process of the shared memory. A second processor reads a first request addressed to the first processor from the host apparatus through a second address translation unit and writes a first response to the first request to the shared memory through the second address translation unit.

A storage system with reduced power consumption includes a storage apparatus that saves data in accordance with a data input/output request from a host or outputs the saved data, the storage system including a plurality of components each configured to operate in a first power mode or at least one second lower power mode in a switchable manner, a condition monitoring module monitoring each of the plurality of components, and a power mode control module that determines a power mode of at least one component to be the second power mode, according to a processing load related to each of the plurality of components and which corresponds to a result of monitoring by the condition monitoring module, and operates the at least one particular component in the power saving mode, in which the plurality of components perform mutual control with the storage apparatus in accordance with the data input/output request.

Storage system and a method of controlling energy consumption therein

A first node receives a read request, determines a storage drive location where data corresponding to one or more logical addresses designated in the read request is stored, and requests transfer of the data at the one or more logical addresses, from the second node, when the storage drive location is the second node. The second node reads a data chunk containing the data designated by the one or more logical addresses, from one or more storage drives, determines whether to decompress the data chunk based on the size of the data chunk and the size of the one or more logical addresses, decompresses the data chunk based on the determination as to decompress the data chunk, extracts data at the one or more logical addresses, and transfers the extracted data to the first node.

To improve performance of a storage system. The storage system includes a plurality of storage nodes that communicate via a network. Each of the plurality of storage nodes includes one or more controllers. At least one controller in the controllers specifies at least two controllers that allocate a cache sub-area where write data is stored based on a controller that receives the write data from a host and a controller that processes the write date, and the cache sub-area is allocated in the specified controllers.

Storage system including storage nodes to determine cache allocations to implement cache control

Storage device accelerator providing aggregation of divided plaintext data read

A storage apparatus includes: a flash memory that provides a storage area; a controller that controls writing and reading of data to and from the storage area; and a buffer memory that temporarily stores data to be written in the storage area, in which the controller selects one compression method from a first reversible compression method and a second reversible compression method based on access performance to the flash memory, and determines to compress data based on the selected one compression method and to write the compressed data to the storage area, and the first reversible compression method has a lower compression ratio and a slower compression speed than the second reversible compression method.

Storage apparatus and control method of storage apparatus

Storage device accelerator providing aggregation of divided plaintext data

A storage apparatus includes: a controller; and a plurality of storage drives, wherein the controller issues a read command for specifying a value associated with an error correction mode to a first storage drive of the plurality of storage drives, the first storage drive selects the error correction mode associated with the value specified by the read command from a plurality of error correction modes, the plurality of error correction modes include a first error correction mode and a second error correction mode with a higher correcting capability and a longer maximum delay time than those of the first error correction mode, and the first storage drive executes a read of data from a storage medium in the selected error correction mode.

Storage apparatus

A system including a first storage drive and a superior device superior to the first storage drive, wherein the superior device specifies a first allowable environmental temperature that makes the remaining lifetime of the first storage drive longer than the remaining operation schedule period of the first storage drive, and controls an environmental temperature adjusting device that adjusts the environmental temperature of the first storage drive on the basis of the first allowable environmental temperature.

Control method of environmental temperature of storage drive

A storage system includes a controller and a nonvolatile memory drive, in which the controller transmits a write request that designates a volume identifier of a volume to be provided to a host, to the nonvolatile memory drive; the nonvolatile memory drive exclusively allocates a free block selected from a plurality of blocks to the volume identifier; write data of the write request is written to the free block; when the write data is update write data, an area that stores data to be updated is changed to an invalid data area; and after valid data of a block including the invalid data area is migrated to another block, all data of the block including the invalid data area is erased.

When a logical capacity of a nonvolatile semiconductor memory is increased, after a logical capacity which is allocated to a RAID group but unused is released, the RAID group is reconfigured to include the released logical capacity and the increased logical capacity. When the logical capacity of the nonvolatile semiconductor memory is reduced, after the reduced logical capacity is released from the RAID group, the RAID group is reconfigured with the released logical capacity.

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Tokyo, Japan

Masahiro Tsuruya