Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2002-11-01
2008-11-25
Wu, Yicun (Department: 2165)
Data processing: database and file management or data structures
Database design
Data structure types
C709S250000
Reexamination Certificate
active
07457822
ABSTRACT:
A hardware-based file system includes multiple linked sub-modules that perform functions ancillary to client data handling. Each sub-module is associated with a metadata cache. A doubly-rooted structure is used to store each file system object at successive checkpoints. Metadata is stored within an object and/or as a separate object. Provisions are made for allocating sparse objects. A delayed write feature is used for writing certain objects into non-volatile storage. Checkpoints can be retained as read-only versions of the file system. Modifications to the file system are accomplished without affecting the contents of retained checkpoints. The file system can be reverted to a retained checkpoint. Multiple file servers can be interconnected as a cluster, and each file server stores requests from another file server. Interconnections between file servers can be dynamically modified. A distributed locking mechanism is used to control access to file system objects stored by the file servers.
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Aston Christopher J.
Barrall Geoffrey S.
Benham Simon L.
Willis Trevor E.
BlueArc UK Limited
Bromberg & Sunstein LLP
Wu Yicun
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