prefix-preserving-crash-consistency · research · also Prefix-preserving disk model

Prefix-preserving crash consistency

A recovery contract in which surviving updates form a prefix of the specified write order, including all writes covered by the last successful flush.

Related Observatory article: Prefix-preserving crash consistency on hesela.com

OPTR defines order at device request receipt and adds request-level atomicity; this is not application submission order or atomicity of an entire multi-request transaction. Its no-barrier usage relaxes durability. [1]

Relations

related

ftl, snapshot-consistent-ftl, torn-write

Citations

1. Yun-Sheng Chang and Ren-Shuo Liu. OPTR: Order-Preserving Translation and Recovery Design for SSDs with a Standard Block Device Interface. USENIX ATC 2019, pp. 1009-1024; introduction and sections 3, 5-7. (accessed 2026-10-15)
2. Hesela: SSD mapping caches and recovery contracts (accessed 2026-10-15)

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