BSD-LFS, an implementation by
Margo Seltzer was added to 4.4BSD, and was later ported to
386BSD. It lacked support for snapshots. It was removed from FreeBSD and OpenBSD, but still lives on in
NetBSD.
Plan 9's
Fossil file system is also log-structured and supports snapshots.
NILFS is a log-structured file system implementation for
Linux by
NTT/Verio which supports snapshots.
LinLogFS (formerly dtfs) and LFS are log-structured file system implementations for Linux. The latter was part of
Google 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) by
NetApp 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-line
data deduplication.
Cache Accelerated Sequential Layout (CASL) is a proprietary log-structured filesystem developed by
Nimble 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 by
Digital Equipment Corporation for the
OpenVMS 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 as
flash memory and
CD-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 by
wear leveling. The more common such file systems include: