The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 27, 2005
Filed:
Jan. 05, 2001
Lawrence Yium-chee Chiu, Cupertino, CA (US);
Windsor Wee Sun Hsu, Sunnyvale, CA (US);
Honesty Cheng Young, Saratoga, CA (US);
Lawrence Yium-Chee Chiu, Cupertino, CA (US);
Windsor Wee Sun Hsu, Sunnyvale, CA (US);
Honesty Cheng Young, Saratoga, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The present invention discloses a method, apparatus, and article of manufacture for implementing a locking structure for supporting parity protection in a RAID clustered environment. When updating parity, the parity is locked so that other nodes cannot access or modify the parity. Accordingly, the parity is locked, read, generated, written, and unlocked by a node. An enhanced protocal may combine the lock and read functions and the write and unlock functions. Further, the SCSI RESERVE and RELEASE commands may be utlized to lock/unlock the parity data. By locking the parity in this maner, overhead is mininized and does not increase as the number of nodes increases.