Hitachi, Ltd.

Hitachi Vantara Corporation

Tomoyuki Kamazuka

Yuusaku Kiyota

Hideaki Monji

Shumpei Morita

Shoji Kato

Kenshiro Himoto

A compression-expansion control apparatus has a reconfiguration portion capable of configuring one or more compression circuits which compress data in plain text and/or one or more expansion circuits which expand the compressed data on a programmable logical circuit component, a waiting-time observing portion which observes processing waiting-time from when compression processing was requested till when the compression processing is started and processing waiting-time from when expansion processing was requested till when the expansion processing is started, a calculating portion which determines the number or a ratio of the compression circuits and the expansion circuits in the reconfiguration portion on the basis of the processing waiting-time of the compression processing and the processing waiting-time of the expansion processing, and a switching portion which executes reconfiguration of the compression circuit and/or the expansion circuit in the reconfiguration portion on the basis of the number or the ratio determined by the calculating portion.

Compression-expansion control apparatus, storage system, and compression-expansion control method

In a compression mode in which plaintext data is input, and compressed, a first code that is an error detection code is generated with respect to the plaintext data, and compressed. A circuit generates restored plaintext data in which the compressed data is decompressed, for confirming successfulness. A second code that is an error detection code is generated with respect to the restored plaintext data and is compared with the first code. In a case where the first code and the second code agree, the compressed data and the first or second code are output. In a decompression mode, plaintext data is generated in which the input compressed data is decompressed. A third code that is an error detection code is generated with respect to the plaintext data and is compared with an input code, and when the input code and the third code agree, the plaintext data is output.

Compression/decompression apparatus, storage system, and compression/decompression method

A storage system that can achieve a cryptographic operation circuit that supports multiple types of cryptographic operation formats. The cryptographic operation circuit is provided that encrypts data according to the format determined by the processor based on a request by the host terminal for writing the data into the storage device, and decrypts the encrypted data on the data stored in the storage device according to the format determined by the processor based on a request by the host terminal for reading the data from the storage device.

Growing community of inventors

Tokyo, Japan

Tomoyuki Kamazuka