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List of log-structured file systems
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<p> This is an incomplete list of <a href="/facts/Log-structured_file_system/cL4ykhdf">log-structured file system</a> implementations. </p> <ul><li>James T, Brady while in IBM Poughkeepsie Lab conceived a log structured paging file system in 1979 which was implemented in <a href="/facts/MVS/VPSmB9ML">MVS</a> SP2 in 1980.</li> <li><a href="/facts/John_K._Ousterhout/VEgPbRVQ">John K. Ousterhout</a> and <a href="/facts/Mendel_Rosenblum/uVT4UtLT">Mendel Rosenblum</a> implemented the first log-structured file system for the <a href="/facts/Sprite_operating_system/JKCRd5GN">Sprite operating system</a> in 1992.</li> <li><a href="/facts/Log-structured_File_System_(BSD)/N3TeS9pj">BSD-LFS</a>, an implementation by <a href="/facts/Margo_Seltzer/tEJX1FPr">Margo Seltzer</a> was added to 4.4BSD, and was later ported to <a href="/facts/386BSD/XpTXP1ca">386BSD</a>. It lacked support for snapshots. It was removed from FreeBSD and OpenBSD, but still lives on in <a href="/facts/NetBSD/PTm5HWls">NetBSD</a>.</li> <li><a href="/facts/Plan_9_from_Bell_Labs/pQjPlS7w">Plan 9</a>'s <a href="/facts/Fossil_(file_system)/g1rVbjKX">Fossil</a> file system is also log-structured and supports snapshots.</li> <li><a href="/facts/NILFS/M2169PUW">NILFS</a> is a log-structured file system implementation for <a href="/facts/Linux/9FvCKSTq">Linux</a> by <a href="/facts/NTT%2fVerio/0zrzwrHA">NTT/Verio</a> which supports snapshots.</li> <li>LinLogFS (formerly dtfs) and LFS are log-structured file system implementations for Linux. The latter was part of <a href="/facts/Google_Summer_of_Code/M8rDIn6W">Google Summer of Code 2005</a>. Both projects have been abandoned.</li> <li>LFS is another log-structured file system for Linux developed by Charles University, Prague. It was to include support for snapshots and indexed directories, but development has since ceased.</li> <li><a href="/facts/Write_Anywhere_File_Layout/khNSxXso">Write Anywhere File Layout</a> (WAFL) by <a href="/facts/NetApp/tmNFS1pG">NetApp</a> is a file layout that supports large, high-performance RAID arrays, quick restarts without lengthy consistency checks in the event of a crash or power failure, and growing the filesystems size quickly. Built using log-structured file system concept, snapshots and off-line <a href="/facts/Data_deduplication/sHuJ8zya">data deduplication</a>.</li> <li><a href="/facts/LSFS/cL4ykhdf">LSFS</a> is a log-structured file system with writable snapshots and inline <a href="/facts/Data_deduplication/sHuJ8zya">data deduplication</a> created by <a href="/facts/StarWind_Software/g1nnYUSJ">StarWind Software</a>.</li> <li>Cache Accelerated Sequential Layout (CASL) is a proprietary log-structured filesystem developed by <a href="/facts/Nimble_Storage/0bu9wMMq">Nimble Storage</a> that uses Solid State Devices to cache traditional hard drives.</li> <li><a href="/facts/ObjectiveFS/C1494Inn">ObjectiveFS</a> is a log-structured FUSE filesystem that uses cloud object stores (e.g. Amazon S3, Google Cloud Storage and private cloud object store).</li> <li><a href="/facts/NOVA_(filesystem)/z3rcQpbH">NOVA</a> for byte-addressable <a href="/facts/Persistent_memory/GUwzKhjQ">persistent memory</a> (for example <a href="/facts/Non-volatile_dual_in-line_memory_module/r5qEm9jP">non-volatile dual in-line memory module</a> (NVDIMM) and <a href="/facts/3D_XPoint/JXAGzsJ4">3D XPoint</a>) for Linux developed at the University of California, San Diego, US.</li> <li>Spiralog was a log-structured filesystem created by <a href="/facts/Digital_Equipment_Corporation/ztxs6keA">Digital Equipment Corporation</a> for the <a href="/facts/OpenVMS/rAnHAgpD">OpenVMS</a> operating system. Spiralog was an optional product, and was discontinued due to a variety of problems, including issues with handling full volumes.</li></ul> <p>Some kinds of storage media, such as <a href="/facts/Flash_memory/Cn8JsStx">flash memory</a> and <a href="/facts/CD-RW/W7THUREl">CD-RW</a>, slowly degrade as they are written to and have a limited number of erase/write cycles at any one location. Log-structured file systems are sometimes used on these media because they make fewer in-place writes and thus prolong the life of the device by <a href="/facts/Wear_leveling/N6ot7lGA">wear leveling</a>. The more common such file systems include: </p> <ul><li><a href="/facts/Universal_Disk_Format/QwlH2aPR">UDF</a> is a file system commonly used on <a href="/facts/Optical_disc/vjVDB1GH">optical discs</a>.</li> <li><a href="/facts/JFFS/PwutJbM0">JFFS</a> and its successor <a href="/facts/JFFS2/DBtCSotT">JFFS2</a> are simple <a href="/facts/Linux/9FvCKSTq">Linux</a> file systems intended for raw flash-based devices.</li> <li><a href="/facts/UBIFS/WkQzBBrr">UBIFS</a> is a filesystem for raw <a href="/facts/NAND_flash/Cn8JsStx">NAND flash media</a> and also intended to replace <a href="/facts/JFFS2/DBtCSotT">JFFS2</a>.</li> <li><a href="/facts/LogFS/u4EVncBj">LogFS</a> is a scalable flash filesystem for <a href="/facts/Linux/9FvCKSTq">Linux</a> that works on both raw flash media and block devices, intended to replace <a href="/facts/JFFS2/DBtCSotT">JFFS2</a>.</li> <li><a href="/facts/YAFFS/VhnDVRcG">YAFFS</a> is a raw NAND flash-specific file system for many operating systems (including Linux).</li> <li><a href="/facts/F2FS/8LWmaGAq">F2FS</a> is a new file system designed for the NAND flash memory-based storage devices on Linux.</li></ul>