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docs: update README.md

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Emphasize "large" is an upper bound on the size of filesystem bees
can handle.

New strengths:  largest extent first for fixed maintenance windows,
scans data only once (ish), recovers more space

Removed weaknesses:  less temporary space

Need more caps than `CAP_SYS_ADMIN`.

Emphasize DATA CORRUPTION WARNING is an old-kernel thing.

Update copyright year.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2025-01-10 23:37:04 -05:00
parent 0d251d30f4
commit 46815f1a9d
2 changed files with 26 additions and 26 deletions
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26
README.md
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@ -6,30 +6,30 @@ Best-Effort Extent-Same, a btrfs deduplication agent.
About bees About bees
---------- ----------
bees is a block-oriented userspace deduplication agent designed for large bees is a block-oriented userspace deduplication agent designed to scale
btrfs filesystems. It is an offline dedupe combined with an incremental up to large btrfs filesystems. It is an offline dedupe combined with
data scan capability to minimize time data spends on disk from write an incremental data scan capability to minimize time data spends on disk
to dedupe. from write to dedupe.
Strengths 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) * Space-efficient hash table - 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 * Daemon mode - incrementally dedupes new data as it appears
* Largest extents first - recover more free space during fixed maintenance windows
* Works with btrfs compression - dedupe any combination of compressed and uncompressed files * Works with btrfs compression - dedupe any combination of compressed and uncompressed files
* Works around btrfs filesystem structure to free more disk space * Whole-filesystem dedupe - scans data only once, even with snapshots and reflinks
* Persistent hash table for rapid restart after shutdown * 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 * Constant hash table size - no increased RAM usage if data set becomes larger
* Works on live data - no scheduled downtime required * Works on live data - no scheduled downtime required
* Automatic self-throttling based on system load * Automatic self-throttling - reduces system load
* btrfs support - recovers more free space from btrfs than naive dedupers
Weaknesses Weaknesses
---------- ----------
* Whole-filesystem dedupe - has no include/exclude filters, does not accept file lists * Whole-filesystem dedupe - has no include/exclude filters, does not accept file lists
* Requires root privilege (or `CAP_SYS_ADMIN`) * Requires root privilege (`CAP_SYS_ADMIN` plus the usual filesystem read/modify caps)
* First run may require temporary disk space for extent reorganization
* [First run may increase metadata space usage if many snapshots exist](docs/gotchas.md) * [First run may increase metadata space usage if many snapshots exist](docs/gotchas.md)
* Constant hash table size - no decreased RAM usage if data set becomes smaller * Constant hash table size - no decreased RAM usage if data set becomes smaller
* btrfs only * btrfs only
@ -46,7 +46,7 @@ Recommended Reading
------------------- -------------------
* [bees Gotchas](docs/gotchas.md) * [bees Gotchas](docs/gotchas.md)
* [btrfs kernel bugs](docs/btrfs-kernel.md) - especially DATA CORRUPTION WARNING * [btrfs kernel bugs](docs/btrfs-kernel.md) - especially DATA CORRUPTION WARNING for old kernels
* [bees vs. other btrfs features](docs/btrfs-other.md) * [bees vs. other btrfs features](docs/btrfs-other.md)
* [What to do when something goes wrong](docs/wrong.md) * [What to do when something goes wrong](docs/wrong.md)
@ -69,6 +69,6 @@ You can also use Github:
Copyright & License Copyright & License
------------------- -------------------
Copyright 2015-2023 Zygo Blaxell <bees@furryterror.org>. Copyright 2015-2025 Zygo Blaxell <bees@furryterror.org>.
GPL (version 3 or later). GPL (version 3 or later).

26
docs/index.md
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@ -6,30 +6,30 @@ Best-Effort Extent-Same, a btrfs deduplication agent.
About bees About bees
---------- ----------
bees is a block-oriented userspace deduplication agent designed for large bees is a block-oriented userspace deduplication agent designed to scale
btrfs filesystems. It is an offline dedupe combined with an incremental up to large btrfs filesystems. It is an offline dedupe combined with
data scan capability to minimize time data spends on disk from write an incremental data scan capability to minimize time data spends on disk
to dedupe. from write to dedupe.
Strengths 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) * Space-efficient hash table - 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 * Daemon mode - incrementally dedupes new data as it appears
* Largest extents first - recover more free space during fixed maintenance windows
* Works with btrfs compression - dedupe any combination of compressed and uncompressed files * Works with btrfs compression - dedupe any combination of compressed and uncompressed files
* Works around btrfs filesystem structure to free more disk space * Whole-filesystem dedupe - scans data only once, even with snapshots and reflinks
* Persistent hash table for rapid restart after shutdown * 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 * Constant hash table size - no increased RAM usage if data set becomes larger
* Works on live data - no scheduled downtime required * Works on live data - no scheduled downtime required
* Automatic self-throttling based on system load * Automatic self-throttling - reduces system load
* btrfs support - recovers more free space from btrfs than naive dedupers
Weaknesses Weaknesses
---------- ----------
* Whole-filesystem dedupe - has no include/exclude filters, does not accept file lists * Whole-filesystem dedupe - has no include/exclude filters, does not accept file lists
* Requires root privilege (or `CAP_SYS_ADMIN`) * Requires root privilege (`CAP_SYS_ADMIN` plus the usual filesystem read/modify caps)
* First run may require temporary disk space for extent reorganization
* [First run may increase metadata space usage if many snapshots exist](gotchas.md) * [First run may increase metadata space usage if many snapshots exist](gotchas.md)
* Constant hash table size - no decreased RAM usage if data set becomes smaller * Constant hash table size - no decreased RAM usage if data set becomes smaller
* btrfs only * btrfs only
@ -46,7 +46,7 @@ Recommended Reading
------------------- -------------------
* [bees Gotchas](gotchas.md) * [bees Gotchas](gotchas.md)
* [btrfs kernel bugs](btrfs-kernel.md) - especially DATA CORRUPTION WARNING * [btrfs kernel bugs](btrfs-kernel.md) - especially DATA CORRUPTION WARNING for old kernels
* [bees vs. other btrfs features](btrfs-other.md) * [bees vs. other btrfs features](btrfs-other.md)
* [What to do when something goes wrong](wrong.md) * [What to do when something goes wrong](wrong.md)
@ -69,6 +69,6 @@ You can also use Github:
Copyright & License Copyright & License
------------------- -------------------
Copyright 2015-2023 Zygo Blaxell <bees@furryterror.org>. Copyright 2015-2025 Zygo Blaxell <bees@furryterror.org>.
GPL (version 3 or later). GPL (version 3 or later).