Replace the step-band fan curve with a continuous linear ramp — the bands
flapped at edges (e.g. 45<->65%). Web-researched: linear + 2-3C hysteresis
is the homelab standard; PID is overkill for this slow thermal loop.
fan% now interpolates between env-tunable anchors:
COOL 50C/30% -> 83C/100% (~2.1%/C; ~51% at the ~60C equilibrium)
QUIET 68C/20% -> 83C/100% (near-silent until ~70C)
Both reach 100% at the 83C ceiling. Anti-oscillation: asymmetric
hysteresis (fc_decide) + a MIN_STEP (3%) min-change threshold.
41 bash tests green; deployed + verified live (59C -> 49%, smooth).
[ci skip]
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The host daemon now polls input_select.r730_fan_mode (auto/cool/quiet/
manual) + input_number.r730_fan_manual_pct from ha-sofia each loop and
routes through fc_resolve: manual holds a fixed %, cool/quiet force that
curve, auto keeps the garage-presence behaviour. CEILING still overrides.
Ships HA control now on the running host daemon (no Vault); the cluster
CronJob migration stays the eventual Terraform home (same logic).
HA side (on ha-sofia, auto-git-tracked there): two helpers, an auto-
revert-to-auto automation (60min), mode + %-slider control tiles on the
dashboard-it Server view. Verified end-to-end: HA manual 70% -> fans
12720rpm; revert to auto -> presence curve 50%.
10 new pure-function tests (fc_resolve/fc_clamp); 46 total green.
[ci skip]
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Power/temp sweep (2026-06-05) located the cooling-per-watt knee at ~60%:
60->70% buys only -2C for +21W, and 70->100% buys 0C for +54W (the CPU
floors ~59C at cluster load, so more airflow does nothing). Re-tune the
COOL curve to cap its normal band at 60% (~303W, ~61C); 80/100% become a
high-load safety ramp (>=73/79C) before the 83C ceiling. QUIET unchanged
(already at the 281W / 4800rpm floor). Saves up to ~75W (~650 kWh/yr) vs
full-tilt for the last ~2C. Tests + design doc updated; verified live
(63C, 60%, ~267W).
[ci skip]
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The iDRAC stock curve runs the CPU at ~72°C on the 7080 RPM floor even
under load (optimises for quiet, not cool). Add a bash daemon + systemd
unit that drives the chassis fans from CPU temp on two curves, picked by
garage occupancy (the server is in the garage): COOL when empty
(measured ~58-65°C under load), QUIET near the silent floor when the
ha-sofia garage door shows someone is there (open, or <15min since last
activity).
Manual fan mode is backstopped: bash EXIT trap + systemd ExecStopPost
hand fans back to Dell auto on stop/crash; CPU>=83°C or repeated IPMI
failures do the same. Pushgateway metrics (job=fan_control). 36 unit
tests cover the pure curve/hysteresis/presence/parse logic; DRY_RUN +
RUN_ONCE for integration checks. Deployed and verified on 192.168.1.127
(CPU 70->58°C in cool mode, hysteresis stepping confirmed).
Design: docs/plans/2026-06-04-pve-fan-control-design.md
Runbook: docs/runbooks/fan-control.md
[ci skip]
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
