HAMMER

HAMMER

Infobox filesystem
name = HAMMER
developer = Matthew Dillon
full_name = HAMMER
introduction_date = July 21, 2008
introduction_os = DragonFly BSD 2.0
partition_id =
directory_struct = B-tree
file_struct =
bad_blocks_struct =
max_file_size =
max_files_no =
max_filename_size =
max_volume_size = 1 EiB
dates_recorded =
date_range =
date_resolution =
forks_streams =
attributes =
file_system_permissions =
compression =
encryption =
OS = DragonFly BSD

HAMMER is a high-availability 64-bit clustering file system developed by Matthew Dillon for DragonFly BSD using B-trees. Its features include infinite snapshots, multi-master operation, and self-healing.

Features

* Keeps a full filesystem history, with settable pruning of old data.
* CRC checksumming of metadata.
* Minimal remount time (no fsck required).
* Designed for cluster mirroring and efficient remote access.
* Support for very large file-systems (up to 1 exabyte).
* Ability to re-optimize the layout in the background, on a live filesystem.

Limitations

Requires a pruning/reblocking cron job run a few minutes every night to incrementally clean up and regain space on the filesystem.

Platforms

* DragonFly BSD.

References

* [http://leaf.dragonflybsd.org/cgi/web-man?command=hammer&section=5 hammer(5)] Manpage.
* [http://leaf.dragonflybsd.org/cgi/web-man?command=hammer&section=8 hammer(8)] Manpage.

See also

* List of file systems
* Comparison of file systems

External links

* [http://www.dragonflybsd.org/hammer/ The HAMMER Filesystem] documentation page at DragonFly BSD
* [http://leaf.dragonflybsd.org/mailarchive/kernel/2007-10/msg00006.html HAMMER filesystem update - design document]
* [http://kerneltrap.org/HAMMER HAMMER-related articles] at KernelTrap
* [http://apollo.backplane.com/DFlyMisc/hammer01.pdf "THE HAMMER FILESYSTEM"] , Matthew Dillon, 21 June 2008


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  • Hammer [1] — Hammer, das bekannte Werkzeug, das dadurch wirkt, daß es, nachdem seine entsprechend große Masse in Bewegung versetzt ist, seine lebendige Kraft stoßweise auf einen andern Körper überträgt. Die Bewegung kann die stoßende Masse entweder durch die… …   Lexikon der gesamten Technik

  • Hammer — Ham mer (h[a^]m m[ e]r), n. [OE. hamer, AS. hamer, hamor; akin to D. hamer, G. & Dan. hammer, Sw. hammare, Icel. hamarr, hammer, crag, and perh. to Gr. a kmwn anvil, Skr. a[,c]man stone.] 1. An instrument for driving nails, beating metals, and… …   The Collaborative International Dictionary of English

  • hammer — [ham′ər] n. [ME hamer < OE hamor, akin to Ger hammer, ON hamarr, crag, cliff < IE * k̑omor , stone hammer < base * ak m < ak̑ , sharp, sharp stone > Gr akmē, point, akmōn, anvil] 1. a tool for pounding, usually consisting of a… …   English World dictionary

  • Hammer SV 04 — Hammer SpVg Voller Name Hammer Spielvereinigung 03/04 e. V. Gegründet 1903 Stadion EVORA Arena …   Deutsch Wikipedia

  • hammer — ► NOUN 1) a tool consisting of a heavy metal head mounted at the end of a handle, used for breaking things and driving in nails. 2) an auctioneer s mallet, tapped to indicate a sale. 3) a part of a mechanism that hits another, e.g. one exploding… …   English terms dictionary

  • Hammer [2] — Hammer (hierzu Tafel »Mechanische Hämmer I u. II«), das bekannte, zum Schlagen dienende, aus dem Hammerkopf und Hammerstiel (Helm) bestehende Werkzeug. Der pyramidale Hammerkopf besteht gewöhnlich aus verstähltem Eisen oder Stahl, oft aus Holz,… …   Meyers Großes Konversations-Lexikon

  • HAMMER — Développeur Matthew Dillon Nom anglais HAMMER Introduction 21 juillet 2008 (DragonFly BSD 2.0) Structure Contenu des répertoires Arbre B …   Wikipédia en Français

  • Hammer — Sm std. (9. Jh.), mhd. hamer, ahd. hamar, as. hamar, hamur Stammwort. Aus g. * hamara m. Hammer , auch in anord. hamarr, ae. hamer, homer, hamor, afr. hamer, homer. Anord. hamarr bedeutet auch Stein, Klippe (westgermanisch vermutlich in… …   Etymologisches Wörterbuch der deutschen sprache

  • Hammer — (англ. молоток): Hammer  фамилия Hammer  рок группа, созданная Кози Пауэлом Классическая серия фильмов ужасов студии Hammer HAMMER файловая система ОС DragonFlyBSD См. также Hummer марка автомобилей …   Википедия

  • Hammer-on — Hammer on (англ. hammer on  «набивать»), также восходящее легато  приём игры на струнных инструментах, в особенности на гитаре, заключающийся в извлечение звука путём удара пальцем левой руки по струне. Hammer on обеспечивает… …   Википедия

  • Hammer — Mechanische Hämmer I. Mechanische Hämmer II …   Meyers Großes Konversations-Lexikon

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