hesela.devOpportunistic scrubbing
Opportunistic scrubbing uses ordinary storage accesses as opportunities to verify regions whose inspection age has exceeded a target.
The MASCOTS 2004 archive model attaches overdue-region checks to disk accesses to avoid separate power-ups; infrequent accesses require a periodic fallback. Its reliability results are model-dependent, not measurements of current drives. [1]
A target is not evidence of completed coverage. In Hesela's explicit single-region trace, a 14-day threshold produces its first check on day 29; the model assumes instantaneous successful checks and uses a strict greater-than trigger. It is not a reproduction of the paper's simulator. [2]
In that paper, the opportunity is a disk access, while the inspection clock belongs to each disk portion. An access can trigger checks of overdue portions other than the requested data; the access itself is not proof of their verification. [1]
Relations
Limitations
- Without an independent fallback or a bound on access gaps, access-only triggering does not bound inspection age. [2]