Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2004-11-23
2008-11-11
Chu, Gabriel L (Department: 2114)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
Reexamination Certificate
active
07451341
ABSTRACT:
A method for controlling communications paths in a storage system provided between a storage device and a plurality of host devices. The method includes: respectively monitoring communications statuses between each of the host devices and the storage device; detecting whether a prescribed temporary failure, which can be corrected without switching communications paths, has occurred, based upon the detected communications statuses; a switching instruction step of not outputting a switching request signal for requesting switching from a failed communications path to a to-be-used communications path, before a number of occurrence of the prescribed temporary failure thus detected reaches a threshold value which is equal to or larger than 2, and outputting the switching request signal only when the number of occurrence of the prescribed temporary failure reaches the threshold value; and selecting the to-be-used communications path, from among the plurality of communications paths, on the basis of the switching request signal.
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“Improved Communication Availability by Controlling Retry Counts and Times”, IBM Technical Disclosure Bulletin, Dec. 1991, US, vol. 34, iss 7a, pp. 77-79.
Dohi Hironori
Nakamura Hirofumi
Okaki Takuya
Tanabe Masayuki
A. Marquez, Esq. Juan Carlos
Chu Gabriel L
Fisher Esq. Stanley P.
Hitachi , Ltd.
Reed Smith LLP
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