tldr/pages/linux/duperemove.md

duperemove

Finds duplicate filesystem extents and optionally schedule them for deduplication. An extent is small part of a file inside the filesystem. On some filesystems one extent can be referenced multiple times, when parts of the content of the files are identical. More information: https://markfasheh.github.io/duperemove/.

• Search for duplicate extents in a directory and show them:

duperemove -r {{path/to/directory}}

• Deduplicate duplicate extents on a Btrfs or XFS (experimental) filesystem:

duperemove -r -d {{path/to/directory}}

• Use a hash file to store extent hashes (less memory usage and can be reused on subsequent runs):

duperemove -r -d --hashfile={{path/to/hashfile}} {{path/to/directory}}

• Limit I/O threads (for hashing and dedupe stage) and CPU threads (for duplicate extent finding stage):

duperemove -r -d --hashfile={{path/to/hashfile}} --io-threads={{n}} --cpu-threads={{n}} {{path/to/directory}}