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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.
- HAMMER
- Modified B+ tree
- Matthew Dillon
- July 21, 2008; 15 years ago with DragonFly BSD 2.0
Jan 17, 2023 · HAMMER1 was the original iteration of the hammer series of file-systems written for DragonFly. It provides instant crash recovery, multi-volume file systems, integrity checking, fine grained history/undo, networked mirroring, and historical read-only snapshots. Note that HAMMER2 is the default file system for DragonFly.
HAMMER2 is a successor to the HAMMER filesystem, redesigned from the ground up to support enhanced clustering. HAMMER2 supports online and batched deduplication , snapshots , directory entry indexing, multiple mountable filesystem roots , mountable snapshots, a low memory footprint , compression , encryption , zero-detection, data and metadata ...
- UNIX permissions
- Matthew Dillon
- HAMMER2
- June 4, 2014; 9 years ago with DragonFly BSD 3.8
Files-11 – OpenVMS file system; also used on some PDP-11 systems; supports record-oriented files; Flex machine file system; HAMMER — clustered DragonFly BSD filesystem, production-ready since DragonFly 2.2 (2009) HAMMER2 — recommended as the default root filesystem in DragonFly since 5.2 release in 2018
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Aug 13, 2019 · 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. [4]
Effectively Hammer is capable of rewriting the entire contents of the file-system while it is live-mounted. • All Hammer identifiers are 64 bits, including the i-node number. Thus Hammer is able to construct a completely unique i-node number within the context of the file-system which is never reused throughout the life of the file-system.
