Fujitsu Corporation

Hidefumi Kobayashi

Tatsuya Yanagisawa

Mihoko Tojo

Atsushi Igashira

Hideo Takahashi

Yoshihito Konta

Marie Abe

Koutarou Nimura

Yasuhiro Ogasawara

Shigeru Akiyama

Satoshi Yazawa

Atsushi Ishii

Masatoshi Nakamura

Wataru Iizuka

Hideo Masuda

Rei Hirose

Daisuke Miyazaki

Kenji Kobayashi

Kazuo Nakashima

Akihito Kobayashi

Satoshi Hayashi

Tsukasa Makino

Motohiro Sakai

Hidetoshi Nishi

Shinichiro Matsumura

Tsukasa Matsuda

Minoru Muramatsu

Keiichi Umezawa

Yuusuke Oota

Yusuke Oota

A storage control device of controlling a storage device includes memory; and processor circuitry coupled to the memory, the processor circuitry being configured to perform processing, the processing including: determining a mode that indicates how to back up configuration information of the storage device on a basis of a redundant configuration state with another storage control device; and backing up the configuration information from a memory to a backup device on a basis of the determined mode.

Storage control device, storage device, and non-transitory computer-readable storage medium for storing storage control program

A first control apparatus includes a first memory unit including a local cache, a first power supply that supplies electric power to the first memory unit, and a control unit. The control unit controls a write into a memory device by a write-back method, using the local cache. The control unit mirrors data of the local cache in a mirror cache of a second control apparatus. The control unit determines whether the mirror cache is included in a second memory unit that receives electric power from a second power supply of the second control apparatus, upon detecting an abnormal state of a battery for supplying electric power to the second memory unit in case of power outage of the second power supply. The second memory unit switches write control for the memory device to a write-through method, when the second memory unit includes the mirror cache.

Storage system and control apparatus

A storage system includes control devices and a second processor. The second processor determines a number of abnormal batteries when an abnormality has occurred in a first battery. The second processor assigns a second cache currently assigned to a second control device associated with the first battery to a first control device when the number is smaller than a threshold. The second processor assigns a mirror cache currently assigned to the second control device to a third control device when the number is smaller than the threshold. The second processor instructs the first control device to control write to a first storage device associated with a first cache by using the first cache. Data of the first cache is mirrored to the mirror cache. The second processor instructs the first control device to control write to a second storage device associated with the second cache by using the second cache.

Storage system and monitor device

A control device including a processor. The processor configured to allocate a data area of a memory device to a plurality of memory areas of data blocks of a first size; allocate identical data blocks of the first size to a plurality of the data areas of the memory device; manage management information indicating a data storing state of the plurality of memory areas of data blocks of the first size in each data area; determine, based on the management information regarding a plurality of data areas allocated with respect to a data block to be written, one data area from the plurality of data areas; and generate write data of a second size, which is different from the first size, including data of the data block to be written and write the write data in the one data area.

Control device, storage device, and computer-readable recording medium having stored therein control program

Write commands for a storage device specify write data with either a first data step size or a second data step size. In the former case, the storage device performs a read-modify-write (RMW) cycle which includes reading data with the second data step size. In the latter case, the storage device executes the command in a single write cycle. A command sorting unit sorts received commands into two groups, first commands and second commands, when storing them in a memory. First commands are write commands whose data boundaries do not match with the second data step size. Second commands include write commands whose data boundaries match with the second data step size. A command issuing unit converts first commands into a second command upon predetermined conditions. The command issuing unit issues the second commands to the storage device, in preference to the first commands.

Apparatus and method for reducing read-modify-write cycles by combining unaligned write commands

An information processing apparatus that performs a startup control of redundantly configured modules includes a memory to retain abnormality information regarding an abnormality that occurs at time of startup control of the modules, and a startup controller section executing a startup process by sequentially executing the process, generating the abnormality information, determining whether a reduced operation is possible or not when the module in which an abnormality occurs at the time of startup control is detected, completing an execution of the process block in progress when it is determined that the reduced operation is possible, executing a restart process on a module selected from all the modules in which abnormalities occur at the time of startup control based on the abnormality information and completing an execution of the process block in progress after completing the restart process when determined that the reduced operation is not possible.

Apparatus and method for handling abnormalities occurring during startup

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

In a storage system, a first reboot controller in a first control apparatus causes a second control apparatus to reboot, when it is detected that a second control apparatus has stopped access operations. The first reboot controller also places a boot event record in a non-volatile storage device of the second control apparatus to indicate that the rebooting of the second control apparatus has been caused by the first control apparatus. After that, a second reboot controller in the second control apparatus causes at least the first control apparatus to reboot while keeping intact the cache data stored in a cache memory of the first control apparatus, when the access controller of the first control apparatus is stopped while the second control apparatus is rebooted, and when a boot event record is found in the non-volatile storage device of the second control apparatus.

Storage system, control apparatus and control method therefor

An apparatus includes a cache memory for storing user data and control information of the apparatus, a nonvolatile memory and a processor for executing a process including when the power failure occurs, saving the user data and the control information stored in the cache memory into the nonvolatile memory, when the power failure recovers, restoring the data stored in the nonvolatile memory into the cache memory, and erasing the data stored in the nonvolatile memory after restoring the data into the cache memory and when another power failure occurs during erasing the data stored in the nonvolatile memory, erasing the control information stored in the nonvolatile memory if the control information is remained in the nonvolatile memory and saving, into the nonvolatile memory, the updated control information stored in the cache memory and the user data which has been erased from the nonvolatile memory.

Data storage device and method

A disk control apparatus performing input/output control of data of a storage disk device according to an input/output request from a host includes a cache memory which stores a part of the data and a management table which has format information for indicating whether a track of the storage disk device has been initialized to a predetermined track format for each track of the storage disk device. A control unit creates track format information of the predetermined track format referring to the management table when an input/output request is received from the host. A remote unit transfers initialization information of the management table to another disk control apparatus of a secondary center according to a copy instruction from the host. The control unit updates the format information of the target track in the management table to complete initialization of the target track.

Remote disk control apparatus, and remote disk control method

A disk control apparatus formats each track of a storage disk device in a short time. The disk control apparatus () has a cache memory () which stores a part of data, a management table () which indicates whether a track of the storage disk device () has been initialized to a predetermined track format, and control units () which create the track format referring to the management table () when an input/output request is received from the host (). The factory shipment format flag of this management table is set to '1' when factory formatting is executed, and the table is transferred to the disk. By this method, high-speed factory formatting is possible.

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Yokohama, Japan

Hidefumi Kobayashi