izebra_projects/fan_speed
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Enforce that full cooling arrives no later than the disk alarm

Browse Source 
DISK_RAMP_HIGH_OFFSET below DISK_ALARM_OFFSET means the alarm fires
while there is still cooling left unused. iz-pve0 was tuned that way by
hand (full at limit-2, alarm at limit-5), which would have mailed 3c
before the fans were actually flat out, for every drive class.

check_ramp_ordering() now clamps at startup and logs it, rather than
exiting - a fan controller that refuses to start leaves the fans
wherever they were.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Zeb Hering
2026-08-28 21:49:50 -07:00
parent 02cd1a4004
commit 86f3b0c323
3 changed files with 45 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
fan_speed.sh
View File

@@ -117,6 +117,11 @@ selftest() {
# leak is what let the setpoint drift 32 -> 36 -> 31 on iz-pve0.
check "re-assert re-pushes held value" 32 "$(next_fan_speed 34 32)"
echo "ramp/alarm ordering (full cooling must arrive no later than the alarm):"
ramp_ordering_ok 8 5 && check "full at limit-8, alarm at limit-5" ok ok || check "full at limit-8, alarm at limit-5" ok bad
ramp_ordering_ok 5 5 && check "full and alarm coincide" ok ok || check "full and alarm coincide" ok bad
ramp_ordering_ok 2 5 && check "full at limit-2 is rejected" bad ok || check "full at limit-2 is rejected" bad bad
echo "alert rate limiting:"
local out
out=$( { raise_alert testkey "first" "body"; raise_alert testkey "second" "body"; } | grep -c '^MAIL\[' )
@@ -210,6 +215,7 @@ fi
#######################################
# Read every drive's own temperature limit once - they do not change, and
# smartctl -x is far heavier than the -A used on the fast loop.
check_ramp_ordering
cache_disk_limits
echo "Monitoring $DISK_COUNT_EXPECTED disk(s)."
LAST_SMART_CHECK=0