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A '''log-structured filesystem''' is a [[file system]] design first proposed in 1988 by [[John K. Ousterhout]] and [[Fred Douglis]]. Designed for high write throughput, all updates to data and metadata are written sequentially to a continuous stream, called a log. The design was first implemented by Ousterhout and [[Mendel Rosenblum]].
== Rationale ==
Conventional file systems tend to lay out files with great care for spatial locality and make in-place changes to their data structures in order to perform well on optical and magnetic disks, which tend to seek relatively slowly.
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