Symantec Operating Corporation

Veritas Operating Corporation

Baige Wang

Kirk L Searls

Ynn-Pyng Tsaur

Ynn-Pyng “Anker” Tsaur

A method and mechanism for performing data backups in a computing system. A 'delta' catalog is utilized for the maintenance of data backups. The delta catalog includes a backed up object table and an extent map. For a given backup, the backed up object table update stores entries which identify only those objects backed up during that backup. The backed up object table is further configured to store entries which identify objects which were deleted between the time of a prior backup procedure and a current backup procedure. The extent map is configured identify all objects present in the system at the time of a particular backup. The extent map identifies the objects which were present as one or more sequences of entries in the backed up object table.

Delta catalogs in a backup system

One or more computer systems, a carrier medium, and a method are provided for creating a catalog for backup data using NDMP file history messages. The messages are received at a first computer system (NDMP client) from a second computer system (NDMP host). Each message comprises information describing a filesystem node (a file or directory). The messages comprise hierarchy information and attribute information for the nodes. For each message comprising hierarchy information, an entry may be created for the respective node in a catalog, and the hierarchy information for the respective node may be stored in the catalog. For each message comprising attribute information, the attribute information for the respective node may be stored in the catalog. The messages may be processed in a single pass without caching them all. A carrier medium may include program instructions which, when executed, cause the above operations on one or more computer systems.

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Lake Mary, FL, United States of America

Baige Wang