parity-inconsistency · unknown

Parity inconsistency

A parity inconsistency is a disagreement between stored parity and parity recomputed from the associated data blocks.

The field study uses this class when individual block checksums pass but parity disagrees during a scrub. [1]

A mismatch does not by itself identify the faulty member. Recomputing parity from unvalidated data can instead create parity pollution, where incorrect data and parity agree. [2]

Relations

related
parity-pollution, identity-discrepancy, data-scrubbing, raid-5

Citations

  1. Bairavasundaram et al., An Analysis of Data Corruption in the Storage Stack, FAST 2008, sections 2.2-2.3. (accessed 2026-10-18)
  2. Krioukov et al., Parity Lost and Parity Regained, FAST 2008, sections 4.2-4.6. (accessed 2026-10-18)

Further reading

  1. Hesela: interpreting the historical field study of silent corruption (accessed 2026-10-18)
Sources & caveats

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Hesela team. Parity inconsistency. Hesela. 2026-10-18. https://hesela.dev/terms/parity-inconsistency/