Publication number: 20070002482
Abstract: 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.
Type:
Application
Filed:
September 29, 2005
Publication date:
January 4, 2007
Applicant:
FUJITSU LIMITED
Inventors:
Hidejirou Daikokuya, Hideo Takahashi, Yoshihito Konta, Yasutake Sato, Hiroaki Sato, Norihide Kubota, Masami Ikeno, Tadashi Hirano, Tsuyoshi Nakagami, Yuuji Noda, Yusuke Inai, Naoyoshi Toshine, Mikio Ito, Kazuhiko Ikeuchi, Yukihiro Yoshiya, Nobuyuki Kikuchi, Masaru Shimmitsu, Eisaku Takahashi