DE-DUPLICATION STORAGE SYSTEM WITH MULTIPLE INDICES FOR EFFICIENT FILE STORAGE

摘要

A de-duplication storage system which uses multiple indices is described. A first group of one or more indices may be stored in random access memory (RAM) or another type of fast storage. A second group of one or more indices may be stored on one or more disk drives or another type of storage where large amounts of data can be stored inexpensively. The first group of indices may be used when adding new files to the de-duplication storage system in order to determine whether the file segments of the new files are already stored. The second group of indices may be used when restoring files in order to lookup the segments of the files.