Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2003-05-29
2008-07-15
Alam, Hosain (Department: 2166)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C707S793000, C707S793000, C709S219000
Reexamination Certificate
active
07401081
ABSTRACT:
An apparatus for providing storage control in a network of storage controllers is disclosed. The apparatus includes an owner storage controller; an I/O performing component, an ownership assignment component, a lock manager and a messaging component. The ownership assignment component assigns ownership of metadata for data to an owner storage controller. The lock manager controls the locking of metadata during I/O. The messaging component passes messages among storage controllers to request metadata state, to grant locks, to request release of locks, and to signal lock release. The I/O is performed on data whose metadata is owned by an owner storage controller, subject to compliance with metadata lock protocols controlled by the owner storage controller, and any copy of the data held from time to time is maintained in a coherency relation with the data.
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Fuente Carlos Francisco
Scales William James
Alam Hosain
Dillon & Yudell LLP
International Business Machines Corporartion
Lin Shew-Fen
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