Seagate Technology Incorporated

Other

Gerald A Houlder

Brian Thomas Edgar

Michael H Miller

Kenneth William Preslan

Steven R Soltis

Raymond Wesley Gilson

Edward Alan Soltis

Matthew O'Keefe

Yong Yang

Vidya Krishnamurthy

Shuangyi Tang

James Allen Coomes

Weihua Lin

Thomas M Ruwart

Physical subsector error marking allows for selectively marking subsectors of a physical sector of a storage medium as unreadable. The error marking may include a bad sector mask to indicate that the subsector is unreadable combined with an error signature to confirm that the bad sector mask was set intentionally. The remaining readable subsectors of the physical sector may be returned to the host.

Physical subsector error marking

A system includes shared Small Computer System Interface (SCSI) storage devices for processing clients coupled by a fiber channel interface. The storage devices include storage blocks, and locks controlling their use by clients. Clients issue actions to the storage devices for performing operations on the locks. A client may exclude other clients from using storage blocks using a state element to acquire the lock for shared or exclusive use. If the client modified the data, a version counter in the lock is updated when the lock is released. If an activity bit is set, the version counter is updated upon both reading and writing. Other clients can forcibly release a lock owned by a failed client by monitoring its version counter. Expiration timers associated with the locks allow acquired locks to be released by timing out. A serverless global file system (GFS) manages use of the shared storage resources, and allows remapping of the locks to the storage blocks, for example, based on activity of the locks.

Global file system and data storage device locks

Data storage device with small computer system interface providing persistent reservations

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Bloomington, MN, United States of America

Gerald A Houlder