BSD-LFS, an implementation byMargo Seltzer was added to 4.4BSD, and was later ported to386BSD. It lacked support for snapshots. It was removed from FreeBSD and OpenBSD, but still lives on inNetBSD.
Plan 9'sFossil file system is also log-structured and supports snapshots.
NILFS is a log-structured file system implementation forLinux byNTT/Verio which supports snapshots.
LinLogFS (formerly dtfs) and LFS are log-structured file system implementations for Linux. The latter was part ofGoogle Summer of Code 2005. Both projects have been abandoned.
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.
Write Anywhere File Layout (WAFL) byNetApp 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,[citation needed] snapshots and off-linedata deduplication.
Cache Accelerated Sequential Layout (CASL) is a proprietary log-structured filesystem developed byNimble Storage that uses Solid State Devices to cache traditional hard drives.[6]
ObjectiveFS is a log-structured FUSE filesystem that uses cloud object stores (e.g. Amazon S3, Google Cloud Storage and private cloud object store).
Spiralog was a log-structured filesystem created byDigital Equipment Corporation for theOpenVMS operating system.[8] Spiralog was an optional product, and was discontinued due to a variety of problems, including issues with handling full volumes.[9]
Some kinds of storage media, such asflash memory andCD-RW, 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 bywear leveling. The more common such file systems include:
