File Versioning for Block-Level Continuous Data Protection

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File Versioning for Block-Level Continuous Data Protection
Block-level continuous data protection (CDP) logs every disk block update so that disk updates within a time window are undoable. Standard file servers and DBMS servers can enjoy the data protection service offered by block-level CDP without any modification. Unfortunately, no existing blocklevel CDP systems can provide users a file versioning view on top of the block versions they maintain. As a result, the data they maintain cannot be used as an an extension to the on-line system with which users routinely interact. This paper describes a name-based user-level file versioning system called UVFS that is designed to reconstruct file versions from disk block versions maintained by a blocklevel CDP. UVFS reconstructs file versions by following the last modified time of files and directories, a common file metadata supported by almost all modern file systems, and therefore does not require any modification to the host file system that a block-level CDP system protects. In add...
Maohua Lu, Tzi-cker Chiueh
Added 08 Mar 2010
Updated 08 Mar 2010
Type Conference
Year 2009
Authors Maohua Lu, Tzi-cker Chiueh
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