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Work on the " early " Sprite outlined above ended around 1987, but was improved during the next year.

Starting in 1990 Sprite was used as the basis for development of the first log-structured file system ( LFS ), development of which continued until about 1992.

LFS dramatically increases the performance of file writes at the expense of read performance.

Under Sprite, this tradeoff is particularly useful because most read access was cached anyway — that is, Sprite systems would typically perform fewer reads than a normal Unix system.

LFS-like systems also allow for much easier crash recovery, which became a major focus of the project during this period.

Additional experimentation on striped file systems, both striped across different machines as well as clusters of drives, continued until about 1994.