 | This article contains promotional content. (December 2021) |
| Developer(s) | Matthew Dillon |
|---|---|
| Full name | HAMMER |
| Introduced | July 21, 2008 with DragonFly BSD 2.0[1][2] |
| Structures | |
| Directory contents | Modified B+ tree[3] |
| Limits | |
| Max volume size | 1 EiB[3] |
| Features | |
| Forks | No |
| File system permissions | UNIX permissions |
| Transparent compression | Yes[4] |
| Data deduplication | On demand |
| Other | |
| Supported operating systems | DragonFly BSD |
HAMMER is a high-availability 64-bit file system developed by Matthew Dillon for DragonFly BSD using B+ trees. Its major features include infinite NFS-exportable snapshots, master–multislave operation, configurable history retention, fsckless-mount, and checksums to deal with data corruption.[5] HAMMER also supports data block deduplication, meaning that identical data blocks will be stored only once on a file system.[6] A successor, HAMMER2, was announced in 2011 and became the default in Dragonfly 5.2 (April 2018).[7]
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dedup-devblogwas invoked but never defined (see the help page). - ^ Dillon, Matthew (11 May 2011). "HAMMER2 announcement". users (Mailing list).