Patent ID: 8438139

Claim:
A system for rewriting data in a deduplication storage environment, comprising: a plurality of user files including original deduplication (DFS) files; a sequential deduplication file system in communication with the plurality of user files; a dynamic non-deduplicated file system in communication with the plurality of user files including a plurality of dynamic metadata files having entries pointing to corresponding sections of the original DFS files; and at least one processor device, operable in the deduplication storage environment, wherein the at least one processor device is adapted for: creating a new deduplication file system (DFS) file to be stored as part of the plurality of user files, directly writing rewritten sections of one of the original DFS files resulting from rewrite operations into the new DFS file, quoting unmodified sections of the one of the original DFS files unaffected by rewrite operations into the new DFS file, and deleting the one of the original DFS files.