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mirror of https://github.com/Zygo/bees.git synced 2025-05-17 21:35:45 +02:00
Zygo Blaxell f5c4714a28 roots: add 'recent' crawl mode for a mix of new and old data
Crawl mode 3 'recent' prioritizes data from new updates to previously
scanned subvols over subvols that have not been completely scanned yet.
If no such new data exists, falls back to a variation of 'lockstep'
scan mode.

This enables us to keep up with new data as it arrives, a key weakness
of all the other scan modes, and worth violating our unwritten "no new
scan modes until we have extent-tree dedupe working" policy for.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
2022-12-20 20:51:00 -05:00
2016-11-17 12:12:15 -05:00
2022-07-29 22:20:02 -04:00

BEES

Best-Effort Extent-Same, a btrfs deduplication agent.

About bees

bees is a block-oriented userspace deduplication agent designed for large btrfs filesystems. It is an offline dedupe combined with an incremental data scan capability to minimize time data spends on disk from write to dedupe.

Strengths

  • Space-efficient hash table and matching algorithms - can use as little as 1 GB hash table per 10 TB unique data (0.1GB/TB)
  • Daemon incrementally dedupes new data using btrfs tree search
  • Works with btrfs compression - dedupe any combination of compressed and uncompressed files
  • NEW Works around btrfs send problems with dedupe and incremental parent snapshots
  • Works around btrfs filesystem structure to free more disk space
  • Persistent hash table for rapid restart after shutdown
  • Whole-filesystem dedupe - including snapshots
  • Constant hash table size - no increased RAM usage if data set becomes larger
  • Works on live data - no scheduled downtime required
  • Automatic self-throttling based on system load

Weaknesses

  • Whole-filesystem dedupe - has no include/exclude filters, does not accept file lists
  • Requires root privilege (or CAP_SYS_ADMIN)
  • First run may require temporary disk space for extent reorganization
  • First run may increase metadata space usage if many snapshots exist
  • Constant hash table size - no decreased RAM usage if data set becomes smaller
  • btrfs only

Installation and Usage

More Information

Bug Reports and Contributions

Email bug reports and patches to Zygo Blaxell bees@furryterror.org.

You can also use Github:

    https://github.com/Zygo/bees

Copyright 2015-2022 Zygo Blaxell bees@furryterror.org.

GPL (version 3 or later).

Description
Best-Effort Extent-Same, a btrfs dedupe agent
Readme 1.7 MiB
Languages
C++ 97%
C 1.6%
Makefile 0.8%
Shell 0.6%