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A log-structured filesystem is a file system in which data and metadata are written sequentially to a circular buffer, called a log. The design was first proposed in 1988 by John K. Ousterhout and Fred Douglis and first implemented in 1992 by Ousterhout and Mendel Rosenblum for the Unix-like Sprite distributed operating system. [1]
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 wear leveling. The more common such file systems include: UDF is a file system commonly used on optical discs. JFFS and its successor JFFS2 are simple Linux file systems intended for raw flash-based ...
The Log-Structured File System (or LFS) is an implementation of a log-structured file system (a concept originally proposed and implemented by John Ousterhout ), originally developed for BSD. It was removed from FreeBSD and OpenBSD; the NetBSD implementation was nonfunctional until work leading up to the 4.0 release made it viable again as a ...
NILFS or NILFS2 ( New Implementation of a Log-structured File System) is a log-structured file system implementation for the Linux kernel. It was developed by Nippon Telegraph and Telephone Corporation (NTT) CyberSpace Laboratories and a community from all over the world. NILFS was released under the terms of the GNU General Public License (GPL).
Log-structured file systems. In log-structured file systems, the write-twice penalty does not apply because the journal itself is the file system: it occupies the entire storage device and is structured so that it can be traversed as would a normal file system. Copy-on-write file systems
F2FS was designed on a basis of a log-structured file system approach, which is adapted to newer forms of storage. Jaegeuk Kim, the principal F2FS author, has stated that it remedies some known issues of the older log-structured file systems, such as the snowball effect of wandering trees and high cleaning overhead.
JFFS2. Journalling Flash File System version 2 or JFFS2 is a log-structured file system for use with flash memory devices. [1] It is the successor to JFFS. JFFS2 has been included into the Linux kernel since September 23, 2001, when it was merged into the Linux kernel mainline as part of the kernel version 2.4.10 release.
Log-structured merge-tree. In computer science, the log-structured merge-tree (also known as LSM tree, or LSMT [1]) is a data structure with performance characteristics that make it attractive for providing indexed access to files with high insert volume, such as transactional log data. LSM trees, like other search trees, maintain key-value pairs.
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