Hitachi, Ltd.

Mika Teranishi

Hiroji Shibuya

Toshio Kimura

Shunji Murayama

Kazushige Nagamatsu

Jun Kitahara

Takahisa Kimura

Toshiaki Terao

Nakaba Sato

Nakaba Sata

A storage system is migrated without stopping service provision by a host computer. By this means, in a migration-source storage system, data of the cache memory is destaged, and, next, data received from the host computer is directly written in a logical unit by bypassing the cache memory. On the other hand, in a migration-destination storage system, communication with the migration-source storage system is performed to set setting information of a logical unit of the migration object into a logical unit management table and set a writing mode for the cache memory to a cache-bypass mode. After that, the migration-source storage system blocks a path to the host computer. The migration-destination storage system receives a report of the path block from the migration-source storage system and then opens a path between the own system and the host computer.

Computer system and storage system

The present invention enables program codes to be shared among processors. To prevent the debug operation of one processorfrom affecting the debug operation of the other processors, when detecting a breakpoint during execution of a program code, a debuggeror a debugger stubcontrols the execution of the program code while exchanging breakpoint informationwith the other debuggersor the other debugger stubs. Furthermore, a circuitis created which prevents the program code being carelessly rewritten due to thermal runaway, a bug, and the like of a processor, and the protection setting by the protection logicin the circuitis released only in case the processoraccesses each of a plurality of registers fromtoin specified order.

Controlling program code execution shared among a plurality of processors

One processor core of a plurality of processor cores that are included in a multi-core processor that processes a request from an external device detects a prescribed event, specifies a sub resource that is assigned to the one processor core based on the resource management information that indicates a sub resource of a plurality of sub resources that are included in a physical resource and a processor core that is assigned to the sub resource, and executes a reboot based on the specified sub resource.

Request processing system provided with multi-core processor

Proposed are a file storage apparatus and an access control method capable of facilitating the setting and change of an access right of a user for accessing a file. A first account which only authorizes referral of all files and a second account which authorizes referral and editing of all files are defined in advance as accounts in a file system, and if a workspace unit receives an access request from a client for accessing a file and the access right in the workspace of the user for accessing the target file of the access request and the access right in the file system are different, the workspace unit requests the file system unit to perform the access processing to the file upon switching the account of the user to the first or second account.

File storage apparatus and access control method

A storage controller of the present invention can specify an updated file based on an updated block detected when a differential backup is carried out for a plurality of generations, and can carry out a virus scan for the updated file only. Difference data generated between a primary volume and a backup volume is managed in difference volumes of different generations. A file updated by the host is specified based on an updated block in which the difference data is stored. A virus scan, which makes use of the latest virus pattern file, is executed for this updated file. Furthermore, search information related to the updated file can be created, and this search information can also be saved.

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Ninomiya, Japan

Mika Teranishi