Patent ID: 8433690

Claim:
A method for rewriting data in a deduplication storage environment by a processor device, comprising: creating a plurality of new deduplication file system (DFS) files to be stored as part of a plurality of user files, the plurality of user files including original deduplication file system (DFS) files and being accessible by a sequential deduplication file system and a dynamic non-deduplicated file system, the dynamic non-deduplicated file system including a plurality of dynamic metadata files having entries pointing to corresponding sections of the original DFS files each of the plurality of new DFS files including rewritten data resulting from rewrite operations; grouping the rewrite operations into a set of files having rewritten sections and a set of files having unaffected data; directly writing rewritten sections of one DFS file of the set of files having rewritten sections into an other new DFS file; quoting unmodified sections of the one of the DFS files of the set of files having rewritten section into the other new DFS file, and deleting the original DFS files corresponding to the one of the DFS files of the set of files having rewritten sections.