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fan-control: estimate + expose fan power (fan_watts_est)

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The iDRAC reports only total DCMI watts + RPM (no per-fan power), so add a
cube-law fan-power estimate: fan_W ~= 0.0205*(RPM/1000)^3, calibrated to the
2026-06-05 sweep (fits within ~3W; ~2W floor -> ~99W full). The daemon reads
live RPM each loop and pushes pve_fan_control_fan_rpm + _fan_watts_est.
Surfaced in HA as sensor.r730_fan_power_est + a "Fan Power (est)" card on the
dashboard-it Server view, next to total power. 46 bash tests green; verified
live (9120rpm -> ~15W est).

[ci skip]

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Viktor Barzin 2026-06-05 11:10:27 +00:00
parent 324f2dc3bf
commit 51456a96f6
4 changed files with 41 additions and 7 deletions
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docs/runbooks/fan-control.md
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@ -24,7 +24,10 @@ can't run the fans wrong indefinitely. `CEILING` (83 °C) still overrides
everything → Dell auto. An HA change is applied within one daemon loop (~15 s).
Monitoring sensors on the same view: `sensor.r730_fan_speed` (redfish exporter),
`sensor.r730_fan_control_target` + `sensor.r730_fan_control_mode` (Pushgateway).
`sensor.r730_fan_control_target` + `sensor.r730_fan_control_mode` +
`sensor.r730_fan_power_est` (Pushgateway). `r730_fan_power_est` is an ESTIMATE of
total fan power (the iDRAC reports no per-fan power) — modelled from RPM via the
fan affinity law (∝ RPM³), calibrated to the power sweep (~2 W floor → ~99 W full).
The HA objects (helpers, the auto-revert automation, the REST sensors in
`rest_resources/{idrac_redfish_exporter,fan_control}.yaml`, and the dashboard