The setpoint was a continuous function of instantaneous temperature and
was pushed to the BMC every pass, so ~1% of fan per degree of CPU noise
meant the fans never settled. Measured on iz-pve0: stock iDRAC held one
speed for 5 minutes through 57-59c jitter while this script made 7
changes in 16 minutes off the same signal.
Adds a 5% deadband around the applied speed, with full-speed requests
never held back and a periodic re-assert in case the BMC forgets.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Testing on a second host showed the internal/external split cannot be
inferred: iz-pve1's MD1200 sits behind its own HBA while iz-pve0's
internal drives sit behind a SAS expander, so the previous
"pci-*-scsi-*" glob matched every drive on one host and none on the
other. DISK_EXCLUDE_PATTERN now names the shelf's HBA per host.
Also fixes parse_disk_limit, which used awk's for-in over split fields
and so returned 0 or 70 from "0/70" depending on iteration order.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Fan speed now takes the loudest request from CPU/GPU and from each drive
interpolated against its own reported temperature limit, so bay position
and drive technology stop mattering. Reported limits are clamped by class
because WD Reds report the SCT critical limit (85) rather than an
operating maximum.
Adds a rolling temperature history and four alarms (absolute, rising
trend, SMART health, disk count), rate limited per key with a one hour
cooldown, delivered by mail through the host relay.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
