Fujitsu Corporation

Tsukasa Makino

Hiroaki Ochi

Hideo Takahashi

Kazuhiko Ikeuchi

Mikio Ito

Norihide Kubota

Yoshihito Konta

Shinya Mochizuki

Yasutake Sato

Hidejirou Daikokuya

Hidejiro Daikokuya

Marie Abe

Tomoaki Tsuruta

Yasutake Satou

Atsushi Ishii

Naohiro Takeda

Koji Ohtsuki

Atsushi Igashira

Yuichi Ogawa

Hidefumi Kobayashi

Tatsuya Yanagisawa

Yuki Yamamoto

Mihoko Tojo

Yosuke Usuda

Masanori Ito

Yuusuke Oota

Mihoko Nakajima

Masanori Itou

Reina Okano

An information processing system includes first to third information processing apparatuses. The first information processing apparatus has a first memory with a cache region and outputs a first power failure signal on detecting a power failure. The second information processing apparatus includes a second memory with a mirror cache region that stores mirror data for the cache region and outputs a second power failure signal on detecting a power failure. The third information processing apparatus monitors the first and second information processing apparatuses and, when both apparatuses have stopped operating, determines whether there is a power failure at the first and second information processing apparatuses based on the first and second power failure signals. When there is no power failure at either apparatus, the first and second information processing apparatuses are restarted in a state where data of the first and second memories is held.

Information processing system and control apparatus

A connection monitoring device includes: first and second connection systems in which monitored devices are connected in cascade in forward and backward directions, respectively; a storage unit to store configuration information on connection configuration of the monitored devices and connection permitting information including information on a path permitted between the connection monitoring device and the monitored devices within paths undefined in the configuration information; and a control unit to change from a first monitoring state in which the connection configuration of the monitored devices is monitored in accordance with the configuration information to a second monitoring state in which the connection configuration of the monitored devices is monitored in accordance with the configuration information and the connection permitting information in a case where a configuration modification, accompanied with cutting of any one of connections of the first and second connection systems, of the monitored devices is performed.

Connection monitoring device and connection monitoring method

An information processing apparatus manages activation of a program by a task which is a unit of execution, and executes a task for each sequence in units of process block. The information processing apparatus has a nonvolatile memory which keeps an execution state management table. The execution state of the process block is stored in the execution state management table. The control unit performs a first activation procedure which initializes the execution state management table and, while updating the execution state in the execution state management table, executes the task. When activation by the first activation procedure has failed, the control unit performs activation by a second activation procedure and identifies a suspicious sequence. When activation by the second activation procedure has failed, the control unit performs activation by a third activation procedure and identifies a suspicious task.

Information processing apparatus and activation method

A storage system, a storage managing device, and a storage managing method are provided. The storage system includes plural mount devices in which storage devices are mounted and includes a router connected to at least two loops in which plural mount devices are cascade-connected to one another, an initialization completion determining unit that determines whether an initialization processing of obtaining identification information of the storage devices is completed when the initialization processing concerned is executed by using at least one loop of the loops connected to the router, an initialization time determining unit that determines whether an execution time of the initialization processing elapses a predetermined time based on a determination result of the initialization completion determining unit, and a time extending unit that extends the predetermined time when the determination result indicates that the initialization processing completed and the initialization processing is executed by the plural loops.

Storage system, storage managing device and storage managing method

A storage control apparatus for transmitting data to and receiving data from a plurality of storage devices connected to the same interface, the storage control apparatus includes a memory configured to store a management table registering a burst transfer length of each of the plurality of storage devices, the plurality of storage devices including a first storage device having a first burst transfer length that is a minimum in the management table and a second device having a second burst transfer length; an adjusting controller configured to adjust the second burst transfer length in input and/or output processing if the second burst transfer length registered in the management table is different from the first burst transfer length; and a data transfer controller configured to issue a command for a data transfer to the second storage device on the basis of the adjusted second burst transfer length.

Storage control apparatus, storage system and method

The storage apparatus of the present invention includes a disk controller (CM) that issues a command to a disk via a fabric device. The CM controls the number of commands to be issued to the disk based on the structure of the storage apparatus and the operation state of the storage apparatus.

Storage apparatus, disk controller, and command issue control method

There is provided a management apparatus of a storage apparatus. The management apparatus includes an acquisition determination section that determines whether predetermined identification information can be acquired or not from a mounting apparatus that mounts at least one storage apparatus and has at least one predetermined identification information assigned thereto, and a failure determination section that determines, based on a determination result of the acquisition determination section, an access failure to the storage apparatus mounted in the mounting apparatus has been caused due to a failure of the storage apparatus itself or an interruption of a power supply to the mounting apparatus.

Management apparatus, storage system, and storage apparatus management method

In a system for dispersively storing data and parity in a plurality of storage devices, information in a first storage device is restored by using information stored in the storage devices other than the first storage device when the first storage device fails. And information in a non-restored area in the first storage device and information in a second storage device are restored by using information stored in the storage devices other than the first and the second storage devices when the second storage device fails while the information in the first storage device is being restored.

Storage control apparatus and method

A RAID system access a physical disk according to a host I/O request, and perform Rebuild/Copy back processing, for implementing high-speed Rebuild/Copy back processing without interrupting the processing of a normal I/O. When one disk device out of a plurality of disk devices constituting the RAID configuration fails, the processing size for one time of Rebuild/Copy back to reconstruct the RAID is changed according to the presence of a normal I/O managed in RAID control. When a normal I/O is present, Rebuild/Copy back can be executed without interrupting the processing of the normal I/O, and in a static state where a normal I/O is absent, a processing size larger than the size in that state can be specified so as to implement Rebuild/Copy back processing at high-speed.

RAID system and Rebuild/Copy back processing method thereof

A method and apparatus for enhancing performance of parity check in computer readable media is provided. For example, in a RAID (N+1) configuration, a virtual data strip is added for a calculation of parity. Data of the virtual data strip is set so that a predetermined portion of a data area in the virtual data strip has a predetermined value. Consequently, performance of parity check performed in a data processing system having a RAID configuration can be enhanced.

Method and apparatus for storing a data to memory devices

A RAID system access a physical disk and perform Rebuild/Copy back processing according to a host I/O request, so as to implement high-speed Rebuild/Copy back processing without interfering with the processing of a normal I/O. When one disk device fails, out of a plurality of disk devices constituting a RAID configuration, the controller performs Rebuild/Copy back processing to reconstruct the RAID. In Rebuild/Copy back, the controller reads the data from one disk and writes the data to another disk, so the presence of a normal I/O is judged, and when a normal I/O is absent, read and write of these different disk drives are executed simultaneously. By this, the Rebuild/Copy back time can be decreased.

RAID system, RAID controller and rebuilt/copy back processing method thereof

A magnetic disk apparatus capable of effectively achieving speedup of the response to a read request, a control method and control program therefore are provided. In a control of a magnetic disk apparatus having a RAID configuration in which the same data is written on two disks, a given algorithm is selected from a plurality of different algorithms with respect to the data stored in the disks, read commands are issued to the data stored in the two disks, respectively, according to the selected algorithm and the data that has been read first by the read commands that has been issued to the two disks in a read command issuance step is adopted as read data.

Magnetic disk apparatus, control method and control program therefor

A storage system has a plurality of disk storage devices and a controller for controlling the plurality of disk storage devices, and diagnosis of a write miss to a disk of the disk storage device. The controller for controlling the plurality of disk storage devices attaches an ID to write data, and after write access to the disk drive, the controller reads the write data from the disk drive, and compares the ID of the read data and the attached ID. The controller updates the ID for each write command. Therefore the old write data and the new write data can be identified, accurate diagnosis is possible, and the failure of an individual disk drive can be detected immediately.

Data storage system, data storage control device, and write error diagnosis method for disks thereof

Storage destination controller devices wherein N number of data strips and M number of parity strips comprised in each stripe are determined so that the parity strips are not continuously stored to the same memory device between two consecutive stripes when a plurality of stripes, each comprising the N number of data strips and the M number of parity strips of different types, are distributed and stored to the N+M number of memory devices.

Storage controller and method for storage control with non-contiguous stored parities

A storage control apparatus is provided that comprises a failure monitoring unit arranged to add points in proportion to detected abnormality to find statistically added points for each of N disk devices, the failure monitoring unit issuing an instruction to re-create parity when the statistically added points come closer to a predefined failure determination point, the failure monitoring unit issuing an instruction to disconnect the failed disk device when the statistically added points exceed the failure determination point; and a parity re-creation unit arranged, when receiving the instruction to re-create parity from the failure monitoring unit, to read the plural pieces of user data from (N-1) disk devices to re-calculate parity data for write into the remaining one (1) disk device for each of all addresses of the plurality of disk devices.

Growing community of inventors

Kawasaki, Japan

Tsukasa Makino