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Chris
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* test(scanner): pin Normal mode when no bitrot start is recorded Regression for rustfs/backlog#2905: three consecutive cycles that find no recorded bitrot start currently run Deep through the selection window, and a Normal cycle never records the cadence start. * fix(scanner): anchor the bitrot cadence and budget per-disk I/O Decide the scan mode from a recorded Deep window start only. A cycle that finds no recorded start runs Normal and anchors the bitrot cadence in process memory instead of opening the selection window; the Deep cycle that follows the elapsed cadence records the window start exactly as before. A missing record used to be read as a window that started at cycle 0, which ran Deep for deep_window_cycles cycles whenever the start could not be read back (rustfs/rustfs#8015). The recorded start is also remembered across a skipped or failed save, and /v3/scanner/status reports the cadence state under a new bitrot object. Add a per-local-disk background I/O budget (operations and bytes per second, defaults by detected media, auto|off|<rate>) that DynamicSleeper charges before directory listings and object metadata reads as a hard ceiling layered on the foreground-priority disk admission gate, with runtime config keys, per-disk status, cycle metrics, pacing pressure, usage_freshness, Prometheus series, Helm values, admin config help, and operator docs. Refs rustfs/backlog#2905, rustfs/rustfs#8015, rustfs/rustfs#8377. * test(scanner): expect Normal retries on erasure sets without a bitrot start The pending-PUT retry fixture asserted that a 4-drive set revisits every bucket because the cycle ran Deep. Without a recorded Deep window the cycle now runs Normal on every layout and reuses the cold inventory.