| 摘要 |
A data virtualization storage appliance performs data deduplication transformations on the data. The original or non-deduplicated file system is used as shell to hold the directory/file hierarchy and file metadata. The data of the file system is stored by a separate data storage in a transformed and deduplicated form. The deduplicated data store may be implemented as one or more hidden files. The shell file system preserves the hierarchy structure and potentially the file metadata of the original, non-deduplicated file system in its original format, allowing clients to access file metadata and hierarchy information easily. The data of a file may be removed from the shell file system and replaced with a data layout that specifies the arrangement of deduplicated data segments needed to reconstruct the file data. The data layout associated with a file may be stored in a separate data stream in the shell file system. |
