Hitachi, Ltd.

Hitachi Information & Telecommunication Engineering, Ltd.

Shigeo Homma

Akira Yamamoto

Hiroaki Akutsu

Yoshinori Ohira

Junji Ogawa

Yuko Matsui

Tomohiro Kawaguchi

Hideo Saito

Masanobu Yamamoto

Masayuki Yamamoto

Yoshihiro Asaka

Hiroshi Kawano

Hidenori Suzuki

Masafumi Nozawa

Hiroyuki Kitajima

Hiroshi Nasu

Keishi Tamura

Akira Kurano

Toru Suzuki

Azusa Jin

Kunihiko Nashimoto

Go Uehara

Shoji Sugino

Yoshiaki Kuwahara

Yoshiyuki Noborikawa

Taiki Kono

Yoshiaki Eguchi

Kenta Ninose

Akinobu Shimada

Hideo Tabuchi

Haruaki Watanabe

Masataka Innan

Miho Imazaki

Hiroshi Arakawa

Yoshiki Kano

Kenji Yamagami

Takao Sato

Takashi Tsunehiro

Koji Sonoda

Hisaharu Takeuchi

Tomohiro Yoshihara

Hideyuki Koseki

Susumu Suzuki

Shuji Kondo

Takashi Noda

Koji Iwamitsu

Satoru Ozaki

Kazuhide Sano

Tomohiro Murata

Kenzo Kurihara

Masaharu Akatsu

Daisuke Endo

Rikiya Mizuta

Tomotaro Doi

Takuji Itou

Fumio Yoshioka

Koshi Hoshino

Naoya Machida

Yoshihiko Fujii

Kouji Umemoto

A storage system monitors the first access frequency of occurrence which is the access frequency of occurrence from a host device during a first period, and the second access frequency of occurrence which is the access frequency of occurrence from a host device during a second period shorter than the first period. Along with performing data relocation among the tiers (levels) in the first period cycle based on the first access frequency of occurrence, the storage system performs a decision whether or not to perform a second relocation based on the first access frequency of occurrence and the second access frequency of occurrence, synchronously with access from a host device. Here the threshold value utilized in a decision on whether or not to perform the first relocation is different from the threshold value utilized in a decision on whether or not to perform the second relocation.

Storage system for migrating data between tiers

Storage system

A storage system including a storage controller for compressing a data from a host and a plurality of nonvolatile memory drives for writing the compressed data. The storage controller provides the host with a first logical address space as a logical storage area and includes a plurality of first physical address spaces corresponding to the first logical address space and manages storage areas of the plurality of nonvolatile memory drives. Each of the plurality of nonvolatile memory drives includes a second physical address space that manages a physical storage area of the nonvolatile memory and a second logical address space that corresponds to the second physical address space and to each of the plurality of first physical address spaces. The second logical address spaces and the first logical address space are managed with a common size and a common management size, and leading addresses are aligned with the management size.

Storage system and compression method of storing compressed data from storage controller physical address space to logical and physical address space of nonvolatile memory

An upper system of an NVM device transmits, to the NVM device, a write command that designates a logical address, the write command being associated with an expiration date corresponding to a data expiration date correlated with write target data. The NVM device correlates an expiration date correlated with the write command with a logical address specified from the write command. The NVM device writes pieces of data of which the remaining time which is the time to an expiration date belongs to the same remaining time range to the same physical storage area among the plurality of physical storage areas. The NVM device erases data from a physical storage area when the expiration dates of all pieces of data in the physical storage area have expired.

Storage system having non-volatile memory device

This storage system has one or more non-volatile memory devices and a processor unit that comprises one or more processors connected to the one or more non-volatile memory devices. At least a portion of the non-volatile memory of each of the one or more non-volatile memory devices comprises a user area, which is a storage area to which data is written, and an update area, which is a storage area to which update data for the original data is written. The processor unit changes the user capacity, namely the capacity of the user area, of each of the one or more non-volatile memory devices on the basis of at least one of one or more resource usage rates of the one or more non-volatile memory devices.

Storage system and storage control method

A storage system according to one aspect of the present invention includes a plurality of storage devices using flash memory as a storage medium. The flash memory used for the storage device may include flash memory configured to operate each cell as a cell capable of storing n-bit information or a cell capable of storing m-bit information (where n&#x3c;m). The storage system may periodically acquire a number of remaining erasures from the storage device and predict the lifetime of the storage device by using the acquired number of remaining erasures and the storage device operation time. If the predicted lifetime is less than a predetermined value (service life) a predetermined number of cells may be changed to cells capable of storing n-bit information.

A storage unit according to one aspect of the present invention comprises a storage controller and a plurality of storage devices. Each storage device has nonvolatile semiconductor memories serving as storage media. The controller of each storage device diagnoses the state of degradation of the nonvolatile semiconductor memories, and if one of the nonvolatile semiconductor memories is expected to be nearing end of life, then the controller copies the data stored in that degraded nonvolatile semiconductor memory to another nonvolatile semiconductor memory, and then performs shutdown processing for the degraded nonvolatile semiconductor memory, as well as storage capacity reduction processing.

Storage unit and storage system that suppress performance degradation of the storage unit

A source remote copy configuration in a source storage system is migrated to a destination storage system as a destination remote copy configuration. The destination primary storage apparatus of the destination storage system defines a virtual volume mapped to the primary volume provided by the source primary storage apparatus which is a storage area of the virtual volume; takes over a first identifier of the primary volume to the virtual volume; transfers, when the virtual volume receives an access request, the access request to the source primary storage apparatus to write data in the primary volume; and takes over the first identifier from the virtual volume to another primary volume provided by the destination primary storage apparatus, after completion of copy of data from primary volume of the source primary storage apparatus into primary volume of the destination primary storage apparatus and secondary volume of the destination secondary storage apparatus.

Storage apparatus and storage apparatus migration method

A storage system according to one aspect of the present invention includes a plurality of storage devices using flash memory as a storage medium. The flash memory used for the storage device may include flash memory configured to operate each cell as a cell capable of storing n-bit information or a cell capable of storing m-bit information (where n&#x3c;m), where n=2 and m=3. The storage system may periodically acquire a number of remaining erasures from the storage device and predict the lifetime of the storage device by using the acquired number of remaining erasures and the storage device operation time. If the predicted lifetime is greater than a predetermined value (service life), a predetermined number of cells may be changed to cells capable of storing m-bit information.

Storage system with cells changeable between two different level cell modes based on predicted lifetime

A failure region is specified when a failure occurs in a non-volatile semiconductor memory. When a device controller reads data stored in a specific page in a plurality of non-volatile semiconductor memories to detect an uncorrectable error (UE) of the data stored in the specific page, the device controller executes a diagnosis process including specifying a specific storage circuit that is a storage circuit including the specific page, reading data stored in a part of blocks of the specific storage circuit, and specifying, on the basis of a result of reading data stored in the block, a failure region in the specific storage circuit.

Memory device and storage apparatus

A storage controller stores, for each of a plurality of storage devices, a usable capacity, which is a capacity usable by the storage controller in a logical storage area, configures a first RAID group using a first storage device group among the plurality of storage devices, and allocates, on the basis of a request from a host computer, one of a plurality of pages of the logical storage area in the first RAID group to a virtual volume. The storage controller reduces, when receiving first failure information indicating a failure in a first storage device in the first storage device group from the first storage device, a usable capacity of the first storage device on the basis of the first failure information.

Storage apparatus and storage apparatus control method

The storage system according to the present invention comprises a controller, and multiple storage device constituting a RAID group. When storing write data to multiple discontinuous areas within stripes of a storage device, the storage system transmits a new data transmission command containing information for specifying the multiple discontinuous areas and a write data to the storage device, and thereafter, receives an intermediate parity generated from multiple write data and data before update of the multiple write data from the storage device, and then transmits the received intermediate parity and an intermediate parity transmission command to the storage device storing the parity. Thereafter, a data commitment command containing information for specifying multiple discontinuous areas is transmitted to multiple storage devices, and the storage device storing the parity generates a parity after update from the received intermediate parity and a parity before update corresponding to the intermediate parity, and stores the parity after update in a storage media.

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Tokyo, Japan

Shigeo Homma