Hitachi, Ltd.

Yusuke Funaya

Shinichi Hayashi

Ken Sugimoto

Hirofumi Inomata

Tetsuro Honmura

A data processing system includes a plurality of computers which include a processor and a memory, a storage device which is connected to the plurality of computers to store data, and a management computer controls the plurality of computers. The computer includes a node pool which can perform, stop, and delete one or more nodes. The node pool includes one or more first nodes which function as a data buffer. The management computer causes the node to measure a performance of data transmission between the data buffer and the storage device, determines a number of increased/decreased nodes on the basis of a measurement result of the performance, and notifies the node pool of a command of performing or deleting the first node according to the determined number of increased/decreased nodes. The node pool adjusts a number of the first nodes according to performing or deleting command.

Data processing system

A computer system comprises a computer being coupled to a device via a device interface. The device interface has an error status register and a link status register. An error isolation unit periodically obtains values of the error status register and the link status register. The error isolation unit determine whether an error occurs in the device; determine whether the error is an error to be isolated; determine whether the error is an error to be isolated based on values of the error status register and the link status register re-obtained after elapse of a predetermined time in a case of determining the error is not to be isolated. The error isolation unit detects the error as an error of a protocol caused by stop of a power supply in a case of determining the error is to be isolated.

Computer system and error isolation method

A computer system according to the present invention is composed of a serverhaving a flash memory drivefor cache, a storage systemhaving storage tiers composed of an SSDand an HDD, and a management server having a page tier determination programfor determining the storage tier to which data is to be stored. The page tier determination programmigrates data having a high read access rate out of the pages having a high cache rate to the flash memory driveto a storage tier of the HDD, and confirms so that data is not stored in a duplicated manner to the flash memory driveand the SSD. Further, the data having a relatively high write access rate is migrated to the storage tier of the SSDso as to prevent deterioration of write process performance.

Growing community of inventors

Tokyo, Japan

Yusuke Funaya