Fujitsu Corporation

Daiya Nakamura

Atsuhiro Otaka

Kazuo Nakashima

Joichi Bita

Nobuyuki Honjo

Atsushi Ishii

Hidetoshi Satou

Omar Hame Thielo

Kouichi Tukada

A storage system includes plural storage devices, a controller configured to transmit an access request for controlling an access to at least one of the storage devices, a switching part configured to receive the access request from the controller to select the one of the storage devices based on the access request received from the controller, and a proxy response part configured to transmit, if the selected storage device has failed, a response to the access request instead of the failed storage device responding.

Storage system and control method

According to an aspect of an embodiment, a disk drive diagnosis apparatus is included in a RAID system in which a RAID control unit and a drive enclosure that encloses a disk drive are interconnected via a fabric switch. The apparatus comprises a virtual login processing unit configured to virtually execute a login process for a fabric switch of a disk drive and a control unit configured to notify the RAID control unit of a result of the virtual login process and disconnect from a connection line for the RAID control unit a disk drive that has not normally performed the virtual login process relative to the drive enclosure.

Disk drive diagnosis apparatus

A method of detecting a failure in an information processing apparatus is provided. The method includes detecting at least one of a power supply failure and a unit failure, monitoring the detected unit failures, and determining a detected unit failure for a first unit is erroneous if the monitoring indicates another of the units receiving power from a same power supply system as the first unit has also detected a unit failure. The power supply failure indicates a failure associated with a power supply system affecting more than one of the units, and the unit failure indicates a failure of one of the units.

Method of detecting failure and monitoring apparatus

A storage system has a controller and a plurality of storage devices connected to a pair of loops, the controller diagnoses storage devices and performs automatic high-speed restoration of the loops. A storage system has a controller, a plurality of storage devices, and switch circuits having a plurality of switches to connect each of the plurality of storage devices to loops. When a loop anomaly is detected, a restoration instruction is issued to a switch circuit, the plurality of switches are operated in parallel, storage devices are diagnosed, and according to the diagnosis results, a storage device judged to be anomalous are bypassed from the loop by operating the switches. When a loop anomaly is detected, diagnosis of the disk drives connected to the loop can be performed in parallel, so that the time until automatic restoration of the loop can be greatly reduced.

Storage system and method for automatic restoration upon loop anomaly

The storage apparatus includes a plurality of storage devices for storing information, a control unit controlling the storage device, a switching unit switching a connection between the storage device and the control unit, and a network different from the connection by the switching unit and connecting the storage device and the control unit. Reading of information from the storage device and writing of information into the storage device is performed by the control unit through the switching unit, and when a fault occurs in the storage device, a fault recovery command is sent from the control unit through the network to the corresponding storage device or the switching unit.

Storage apparatus, and method for performing fault recovery of storage apparatus

A storage control apparatus controls physical disks according to the host access using a pair of controllers, while mirroring processing is decreased when data is written to a cache memory and high-speed operation is enabled. The mirror management table is created with allocating the mirror area of the cache memory of the other controller, and acquisition of a mirror page of the cache memory of the other controller is executed referring to the mirror management table without an exchange of mirror page acquisition messages between the controllers.

Growing community of inventors

Kawasaki, Japan

Daiya Nakamura