Creating file recipes for copy overwrite workloads in deduplication file systems

A computer-implemented method of creating file recipes for fastcopy overwrite backup workloads (FCOW) in a deduplication backup system, comprising:

• receiving a target file copied through a fastcopy overwrite operation on a base file that overwrites incremental segments deduplicated by the backup system;
• opening the target file in read/write mode, wherein the overwritten segments are inserted at respective offsets;
• trapping seek offsets and write byte lengths for the overwritten segments;
• and
• writing extent information comprising offset differences to a file recipe that facilitates file processing optimizations including differencing, replication, and tiering.

A computer program product, comprising a non-transitory computer-readable medium having a computer-readable program code embodied therein, the computer-readable program code adapted to be executed by one or more processors to implement a method of creating file recipes for fastcopy overwrite backup workloads (FCOW) in a deduplication backup system, comprising:

• receiving a target file copied through a fastcopy overwrite operation on a base file that overwrites incremental segments deduplicated by the backup system;
• opening the target file in read/write mode, wherein the overwritten segments are inserted at respective offsets;
• trapping seek offsets and write byte lengths for the overwritten segments;
• and
• writing extent information comprising offset differences to a file recipe that facilitates file processing optimizations including differencing, replication, and tiering.