identity-discrepancy · unknown

Identity discrepancy

An identity discrepancy is a disagreement between a stored block's identity and the identity expected by its reader.

A valid checksum can accompany a block belonging elsewhere. Logical identity requires file-system context; physical address identity alone cannot establish freshness after a lost write. [2]

In the FAST 2008 field study, identity discrepancies were detected during file-system reads, not RAID-level scrubs. [1]

Relations

related
lost-write, misdirected-write, checksum, parity-inconsistency

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

JSON: /data/terms/identity-discrepancy.json

Published by Hesela team · Updated

Report a correction · Editorial standards · Reuse guidance

Cite this page
Hesela team. Identity discrepancy. Hesela. 2026-10-18. https://hesela.dev/terms/identity-discrepancy/