Hitachi, Ltd.

Hisashi Takamatsu

Akira Kurano

Hisaharu Takeuchi

Akira Yamamoto

Hirofumi Inomata

Toshihiko Tamiya

Yoshiro Shiroyanagi

Mamoru Tohchi

Yuko Matsui

Kenji Muraoka

Hideo Tabuchi

Teiko Kezuka

Masahiro Nakayama

Takashi Oeda

Takao Sato

Akinobu Shimada

Katsunori Nakamura

Masafumi Nozawa

Noboru Morishita

Kiyohiro Obara

Yoshihiro Uchiyama

Yoshiko Matsumoto

Tetsuhiko Fujii

Hisayoshi Kawabata

The plurality of host systems or the plurality of applications include an insertion unit for sending the identifier. The storage controller includes an analysis unit for identifying a host system or an application based on the identifier contained in the access information and analyzing an access pattern of access information sent from the identified host system or application, a management unit for managing the identifier, the analysis result of the access pattern analyzed with the analysis unit, and a control method for controlling the processing of data to be sent from a host system based on the analysis result or data to be stored in a logical volume, and a data processing controller for controlling the processing of data to be sent from a host system or data to be stored in a logical volume according to the control method managed by the management unit.

Storage system and control method thereof

Data in a storage area to be returned from among storage areas of a storage system is deleted without fail, thereby ensuring data security. When a user's storage-on-demand management programis activated in response to a return request from user A's console terminal, the return request is transferred via a communication networkto a server, and a provider's storage on-demand management programmakes a request to a storage management programfor volume initialization and data deletion. After the storage management programissues a volume initialization command after receiving the above request, a control programis activated to initialize the designated volume. Subsequently, the user A's volume access right is deleted by the processing executed by the provider's storage-on-demand management program, and it is reported to the console terminalthat the volume initialization and the volume separation have been conducted.

Storage on-demand system, and method for processing data in the same

A computing system and encryption/decryption method realizes assurance of security and improvement of throughput in a remote system. For this purpose, encrypted data is written to a storage system, it is determined whether data in the storage system is ciphertext or plaintext, and encrypted data is read, decrypted and re-written in storage asyncronously with writing encrypted data to storage.

Computing system and data decryption method and computer system with remote copy facility

A disk array stores data records and parity records. The data records are transferred to the disk array through a control unit that is connected to a host processor. The disk array is part of a disk unit having a processor for generating parity records from information sent by the control unit to the disk unit. The parity record is generated and stored in the disk unit to reduce the number of data transfer operations between the control unit and the disk unit for storage systems using disk array disk units.

Parity storage unit, in a disk array system, for generating updated parity data from received data records

Parity storage unit, in a disk array system, for generating updated

A disk array subsystem includes a logical volume allocation controller, which divides and reallocates data of the same logical volume LVN among a plurality of magnetic disk drive groups when a magnetic disk group is added thereto. Successful logical-volume allocation can reduce the I/O processing frequency between magnetic disk drive groups, thus achieving enhanced performance of the disk array subsystem.

Disk array subsystem with self-reallocation of logical volumes for

Parity storage unit, in a disk array system for generating updated

Storage unit with parity generation function and storage systems using

A storage system comprises a disc drive unit including a plurality of logical drive groups each having a plurality of physical drives, and a disc drive control unit for controlling the information transfer between the disc drive unit and the host system. The logical data arriving from the host system is divided into a plurality of continuous data blocks, from which redundant data is prepared for data restoration. The redundant data is added to the continuous data blocks to provide updated logical data. The storage system is controlled in such a way as to write the updated logical data into a plurality of physical drives. In the case where a fault develops in any of the data blocks of the physical drives to be accessed, redundant data is generated from the updated logical data. The data block of the updated logical data of the physical drive corresponding to the data blocks that has not developed a fault, among the data blocks and the redundant data making up the updated logical data, is stored in the physical drive. The data block of the updated logical data of the physical drive corresponding to the data block that has developed a fault is stored in the nonvolatile memory. The completion of writing the updated logical data into the storage system is reported to the host system. In re-updating the updated logical data, the data block of the re-updated logical data corresponding to the data block of the physical drive that has developed a fault is stored in the physical drives. The data block stored in the nonvolatile memory are stored into an alternate block allocated to the physical drives.

Storage system and method of control

A method of emulating an original record format for a new rotating storage device, including the steps of;

Rotating storage track format emulation

An interrupt control system having a plurality of access paths includes a control memory for storing control information for controlling all of the access paths. When an error occurs on a path, a control unit controlling the respective access paths refers to and updates the control memory to execute a channel reconnection without using the path on which the error has occurred, and then executes a retry command to carry out an error recovery operation.

Input/output system implementing several access paths for rerouting data

A method for controlling a rotating storage unit which parallelly transfers data between a plurality of heads of the rotating storage unit and a plurality of tracks of a record medium is disclosed. When there is a defective sector in any track, a non-defective sector which appears next to the defective sector as viewed in a sequence of logical arrangement of records in the sectors of the tracks is assigned as an alternative sector.

Method for controlling a rotating storage unit

When a disk controller receiving an access from a host computer to a disk device is connected with a disk connection device, if a relevant disk is used by another disk controller, positioning data for seek, set file mask and set sector are queued in a common memory. When the relevant disk becomes free, the disk controller reads the queued information and requires the disk device for positioning. A request of a reconnection with the host computer is issued from the disk controller informed by the disk unit, which has finished positioning at the position specified by the positioning data, search of an aimed record and a read/write operation of transmitted data are effected without any new intervening of an access program of the host computer.

Growing community of inventors

Odawara, Japan

Hisashi Takamatsu