Fujitsu Corporation

Tsuyoshi Nakagami

Kazuhiko Ikeuchi

Hideo Takahashi

Mikio Ito

Hidejirou Daikokuya

Norihide Kubota

Yoshihito Konta

Hiroaki Sato

Chikashi Maeda

Atsushi Igashira

Eisaku Takahashi

Yasutake Sato

Naoyoshi Toshine

Yuji Noda

Yusuke Inai

Yukihiro Yoshiya

Masaru Shimmitsu

Nobuyuki Kikuchi

Tadashi Hirano

Masami Ikeno

Yuuji Noda

A disk management method for managing a disk management device for writing and reading data to and from a disk drive in which a recording medium is managed in a first control unit. The disk management method includes an error checking operation for checking an error on the recording medium in the first control unit, an error correction operation for correcting the error detected in the error, an error correcting operation for correcting the error detected in the error checking operation after converting data including the error to the second control unit, a data loss registration operation for registering a region in which data are lost due to an inconsistency between the first control unit and second control unit in a data loss region table, and a data loss recovery operation for recovering the loss of data with reference to the data loss region table.

Disk management method, disk management device and storage system

In a storage system, a disk device performs recovery and transfers read data to a control device, and the control device judges the validity of the recovery to prevent a transfer of erroneous data. A control device read-accesses a disk device, and the disk device returns read data and a recovered read error response. A control device, at the time of an initial recovered read error, performs a retry of a similar command, and if an error does not occur for read commands including the retry read command, judges the data to be valid. Uncertain data (suspect data) upon occurrence of a recovered read error is restored through disk retry, and accurate read data can be transferred to the host.

Storage system, storage control device, and storage control method detecting read error response and performing retry read access to determine whether response includes an error or is valid

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Kahoku, Japan

Tsuyoshi Nakagami