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HAMMER (file system)

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As of 2019, HAMMER is now often referred to as HAMMER1 to avoid confusion with HAMMER2, although an official renaming has not happened. Both filesystems are independent of each other due to different on-disk formats, and continue to receive separate updates and improvements independently.
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HAMMER file system provides configurable fine-grained and coarse-grained filesystem histories with online snapshots availability. Up to 65536
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HAMMER was developed specifically for DragonFly BSD to provide a feature-rich yet better designed analogue of the then increasingly popular
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As of May 2020, regular maintenance is required to keep the file system clean and regain space after file deletions. By default, a
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Increased disk read speed in certain scenarios by implementing pulse-width modulated time-domain multiplexer on B-tree cursor operation
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job performs the necessary actions on DragonFly BSD daily. HAMMER does not support multi-master configurations.
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HAMMER is optimized to reduce the number of physical I/O operations to cover the most likely path, ensuring
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HAMMER was declared production-ready with DragonFly 2.2 in 2009; in 2012, design-level work shifted onto
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Improved read performance during heavy, concurrent file write operations
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The following performance-related improvements were introduced in
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checksumming of data and metadata, online layout correction and
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allocation with an effectively unlimited number of inodes.
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File system supports 84: 698: 696: 73:Learn how and when to remove this message 457: 34:contains content that is written like 668: 666: 314:HAMMER supports volumes up to 1  7: 591:Sherrill, Justin (7 November 2010). 413:Free and open-source software portal 490:Larabel, Michael (7 January 2011). 673:Vervloesem, Koen (21 April 2010). 277:. HAMMER also supports data block 14: 368:Removed a deadlock stalling issue 921:"git: hammer - HAMMER Version 7" 405: 23: 768:Kemp, Juliet (4 August 2008). 16:File system from DragonFly BSD 1: 798:Jeremy Andrews (2007-10-14). 2524:Filesystem-level encryption 1016:Light Weight Kernel Threads 2681: 1371:Comparison of file systems 421:Comparison of file systems 2434: 2150: 1400: 1366: 703:George, Siju (May 2014). 354:for optimal performance. 2660:Distributed file systems 2474:Extended file attributes 2175:Compact Disc File System 472:(in Russian). 2007-10-14 2573:Installable File System 1041:OS-level virtualisation 593:"Deduplication arrives" 525:"THE HAMMER FILESYSTEM" 238:is a high-availability 1621:TiVo Media File System 1485:Encrypting File System 622:"HAMMER2 announcement" 116:; 16 years ago 1616:Macintosh File System 55:neutral point of view 2629:GUID Partition Table 1976:Distributed parallel 1724:Shared File System ( 800:"HAMMER Performance" 426:List of file systems 2634:Apple Partition Map 2580:Virtual file system 2519:Access-control list 1633:NetWare File System 893:BSD Cross Reference 861:BSD Cross Reference 305:pseudo file systems 87: 47:promotional content 2624:Master Boot Record 2449:Data deduplication 2088:Google File System 2004:Google File System 1490:Extent File System 1452:Byte File System ( 1029:Kernel Normal Form 1022:serializing tokens 324:data deduplication 206:Data deduplication 139:Directory contents 114:July 21, 2008 49:and inappropriate 2642: 2641: 2549: 2548: 2439:Case preservation 2345: 2344: 2044: 2043: 1970: 1969: 1732:Smart File System 1326: 1325: 925:commits@DragonFly 352:sequential access 299:(read–write) and 263:master–multislave 233: 232: 223:operating systems 83: 82: 75: 2672: 2459:Execute in place 2432: 2165:Boot File System 2148: 1912: 1448:Boot File System 1398: 1353: 1346: 1339: 1330: 1003:Operating system 987: 980: 973: 964: 959: 954: 953: 951:Official website 936: 935: 933: 932: 913: 907: 906: 904: 903: 889:"hammer2_disk.h" 881: 875: 874: 872: 871: 849: 843: 842: 833:(22 July 2011). 827: 821: 820: 818: 817: 808:. 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990: 989: 982: 975: 967: 961: 960: 944: 943:External links 941: 938: 937: 927:(Mailing list) 919:(2017-03-27). 917:Matthew Dillon 908: 887:(2018-05-05). 885:Matthew Dillon 876: 855:(2017-09-23). 853:Matthew Dillon 844: 822: 790: 760: 737: 727:on 27 May 2014 692: 662: 631: 609: 583: 557: 539: 509: 482: 456: 455: 453: 450: 449: 448: 443: 438: 433: 428: 423: 417: 416: 400: 397: 377: 374: 373: 372: 369: 366: 347: 344: 335: 332: 326:, and dynamic 290: 287: 247:Matthew Dillon 231: 230: 225: 217: 216: 212: 211: 208: 202: 201: 198: 192: 191: 188: 180: 179: 176: 170: 169: 165: 164: 156: 152: 151: 147: 146: 140: 136: 135: 131: 130: 112: 108: 107: 104: 100: 99: 97:Matthew Dillon 94: 81: 80: 51:external links 31: 29: 22: 15: 13: 10: 9: 6: 4: 3: 2: 2677: 2666: 2665:2008 software 2663: 2661: 2658: 2656: 2655:DragonFly BSD 2653: 2652: 2650: 2635: 2632: 2630: 2627: 2625: 2622: 2621: 2619: 2615: 2609: 2606: 2604: 2601: 2599: 2598:Cryptographic 2596: 2595: 2593: 2591: 2587: 2581: 2578: 2574: 2571: 2570: 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Index

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Developer(s)
Matthew Dillon
DragonFly BSD
B+ tree
EiB
Forks
File system
permissions

Data deduplication
operating systems
DragonFly BSD
64-bit
file system
Matthew Dillon
DragonFly BSD
B+ trees
snapshots
master–multislave
fsckless
checksums
data corruption
deduplication
HAMMER2
master
pseudo file systems

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