Fujitsu Corporation

Fujistu Limited

Kazuhiko Ikeuchi

Hidejirou Daikokuya

Mikio Ito

Norihide Kubota

Chikashi Maeda

Hideo Takahashi

Akira Saito

Yoshihito Konta

Kenji Kobayashi

Atsushi Igashira

Ryota Tsukahara

Hidejiro Daikokuya

Shinya Mochizuki

Tsukasa Makino

Hiroaki Ochi

Yukari Tsuchiyama

Yasutake Sato

Kazuhiro Urata

Akihito Kobayashi

Guangyu Zhou

Koji Uchida

Shinichi Nishizono

Kazuma Takatsu

Katsuhiko Nagashima

Yasutake Satou

Satomi Mamiya

Eisaku Takahashi

Yuji Noda

Yukihiro Yoshiya

Hiroyuki Hoshino

Yoshio Kitamura

Minoru Muramatsu

Tadashi Hirano

Tsuyoshi Nakagami

Hiroaki Sato

Kazuo Nakashima

Koutarou Nimura

Hideki Yamanaka

Fumio Hanzawa

Naoyoshi Toshine

Yusuke Inai

Sanae Kamakura

Masaru Shimmitsu

Nobuyuki Kikuchi

Takaaki Saito

Kuniko Omido

Masami Ikeno

Yuuji Noda

Ryouta Tsukahara

A control device is configured to receive a first write request of first data, calculate a first parity of the first data, store the first data and the first parity into a storage region so that the first data is stored redundantly, identify a certain area which has a possibility that a write process to the certain area is requested after a read process from the certain area is requested, receive a read request of the first data stored in the certain area, read the first data and the first parity, and store the first data and the first parity into a memory, receive a second write request of a second data, calculate a second parity based on the second data, the first data stored in the memory and the first parity stored in the memory, and store the second data and the second parity into the storage region.

Control device, method and non-transitory computer-readable storage medium

In a storage control apparatus, a control unit determines whether prefetching data on a first data amount basis from a plurality of storage devices to a storage unit causes an imbalance in the numbers of commands issued to the storage devices. When determining that the prefetching causes the imbalance, the control unit prefetches the data on a second data amount basis such as to balance the numbers of commands issued to the storage devices. With this approach, the storage control apparatus creates a different imbalance of the number of read commands issued for each execution of prefetch staging, so as to prevent a fixed imbalance in which more read commands are always issued to a specific storage device.

Storage control apparatus and storage control method

A storage control apparatus, that controls a storage apparatus that includes a storage drive in which a plurality of logical volumes are set, includes a storage unit that stores load information for each of the plurality of logical volumes, and a control unit that determines to-be-rebuilt volumes, which are targets to be rebuilt, from the plurality of logical volumes, sequentially selects a logical volumes for which a volume-specific taken time is estimated, determines, for each selected logical volume, a volume-specific start time at which a rebuild will be started, estimates, by using the volume-specific start time and the load information about the selected logical volume, the volume-specific taken time for rebuilding the selected logical volume, and totals the volume-specific taken time estimated for each selected logical volume to calculate a total taken time taken for rebuilding the to-be-rebuilt volumes.

Storage control apparatus, method, and medium for scheduling volume recovery

A control device that controls a reading process of information stored in a unit storage area under control of the control device and a unit storage area under control of a different control device in a distributed manner, the control device includes a processor. The processor executes a procedure including determining whether or not the reading process is a sequential reading process that reads information stored in a unit storage area under control of the control device in an order of logical addresses and whether or not a reading target area of the sequential reading process includes a last address in the unit storage area, and reporting to the different control device control information related to a sequential reading process including the last address determined by the first determination unit.

Control device, and storage system

A storage control apparatus starts, in a group of storage apparatuses that store constituent data that constitute redundant data in a distributed manner in units of a stripe, in regard to respective stripes of a plurality of stripes obtained from a group of target storage apparatuses excluding one of the storage apparatuses, a plurality of rebuilding processes for restoring the constituent data; decides, for each rebuilding process, a stripe for which the rebuilding process is to be performed next, according to access loads on the respective storage apparatuses of the group of target storage apparatuses; and obtains, for each rebuilding process, constituent data corresponding to the decided stripe from the group of target storage apparatuses and executing the rebuilding process, and executes the rebuilding process, to restore constituent data stored in the excluded storage apparatus from the obtained constituent data.

Storage control apparatus, recording medium having stored therein storage control program and storage control method

A storage control apparatus includes a controller to, when more storage devices, among a plurality of storage devices across which a plurality of information areas storing information representing redundant data and one or more spare areas are distributed, than the number of the spare areas fail, perform a rebuild process of information stored in a plurality of information areas of a failed first storage device included in the plurality of combinations of the plurality of information areas and the one or more spare areas, the rebuild process including restoring information corresponding to one information area of the failed first storage device included in one combination among the plurality of combinations, and determining a write destination storage device to which the restored information is to be written in accordance with the number of times information is read from a non-failed second storage device.

Storage control device and storage control method

A CMincludes an unmount detectorand a mount detectorthat monitor unmount and mount of each diskof a RAID configuration, a write request managerthat manages a write request for writing data to a diskthat is unmounted, a consistency determination unitthat, when mount of a diskof the RAID configuration is detected, makes a determination on consistency of the data of the diskin which mount is detected on the basis of the managed write request, and a RAID incorporating unit that, when it is determined that the data lacks consistency, performs processing for recovering data expected to be written by the write request issued to the diskin which mount is detected while the diskis unmounted and incorporates the diskin an original RAID configuration.

RAID configuration management device and RAID configuration management method

A storage control apparatus is communicatively connected to a storage device. The storage device includes a plurality of SSDs. The storage control apparatus includes a processing request controller and a device load detector. The device load detector detects an overload of an SSD by detecting a processing delay of the SSD. When the device load detector has detected an overload of an SSD, the processing request controller suppresses issuance of a request to process write-back with respect to a group by delaying issuance of the write-back.

A storage control device includes a storage unit and a processor. The storage unit is configured to store therein a first score calculated for a first storage device. The processor is configured to add, upon detecting an event occurred in the first storage device, points corresponding to the event to the first score. The processor is configured to determine upon the addition, based on the first score and a second score, whether a sign of failure of the first storage device is detected. The second score is calculated for a first redundant unit of storage devices including the first storage device.

Storage control device and method for controlling storage devices

According to an aspect of an embodiment, a storage system for storing data from a host device, comprising: a plurality of storage units for storing data, in a manner to enable recovery of data stored in one of said storage units by the use of data stored in the rest of storage units; an extra storage unit; and a controller for controlling said storage units and said extra storage unit according to a process comprising: receiving information indicative of fault prediction in one of storage units, recovering data stored in said one of said storage units by the use of data storage in the rest of said storage units, and writing the recovered data into said extra storage unit.

Storage system, storage control method, and storage control program

A control method of controlling a disk storage unit, includes: obtaining, by a computer, for a plurality of sectors allocated on a disk included in the disk storage unit, track identifying information that identifies a track to which sectors belong, in a first order starting from a first start sector; and storing, if first track identifying information obtained in a first sector of the plurality of sectors does not match second track identifying information obtained in a second sector of the plurality of sectors immediately before the first sector, a data length from the first start sector to the second sector in a storage unit.

Control method and system

An information processing apparatus includes: processing units to perform information processing, the processing units being capable of continuing the information processing even if a processing unit in the processing units stops its operation; and a control unit to perform a potential failure detection process of restarting the processing units one by one and outputting information requesting replacement or repair of a processing unit that is not restarted up.

Information processing apparatus and maintenance method of an information processing apparatus

A disk array device includes hard disks from which RAID groups are configured. Therein, a volume setting unit sets one or more used areas. A data check control unit determines, on the basis of the state into which the used areas have been set, which areas in the RAID groups are subject to a diagnosis. A data check execution unit that executes a cyclical diagnosis on the areas determined, by the data check control unit, to be those subject to a diagnosis.

Disk array device and disk array device control method

A disk array device includes: a plurality of disk devices including a strip that stores divided data or a parity; a control device to divide the stripe for each of the plurality of disk devices into the divided data having a size of the strip and write the divided data; and a memory to store new data that corresponds to the divided data stored in the strip, wherein the control device detects whether or not the new data is discrete and performs a first write operation or a second write operation when the new data is discrete.

Disk array device, control device and data write method

A disk array device includes, a cache memory, a plurality of types of disk drives of which data transfer capacity are different, redundant transmission paths that are data transfer paths between the cache memory and the disk drives, and a controller to divide the disk drives into two groups based on the data transfer capacity and allocate each of the two groups to each of the redundant transmission paths when the disk drives have three types.

Disk array device and method for controlling disk array device

Growing community of inventors

Kawasaki, Japan

Kazuhiko Ikeuchi