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Replace system free-RAM warning with ARC headroom check

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The memory warning used plain system-wide 'free' RAM (via free -g), a
carryover from before this script was ZFS-specific. ZFS ARC deliberately
consumes most otherwise-unused RAM, so 'free' being low is normal and not
a meaningful signal — it fired a false alarm on 2026-07-05 (free 5.8Gi,
but available a healthy 45Gi).

Replaced ZFS_REPORT_FREE_WARN_GB with ZFS_REPORT_ARC_FREE_WARN_GB: warns
when ARC headroom (ARC_MAX - ARC_CURRENT) drops below threshold, which is
what actually indicates ARC is running out of room to grow. Available RAM
check is unchanged — it's a legitimate system-pressure signal on its own.
This commit is contained in:
Gmer4Lfe
2026-07-11 17:27:59 -04:00
parent 85c3aef1b0
commit ba07634a88
2 changed files with 27 additions and 18 deletions
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Deployment/master.conf.template
+1 -1
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@@ -1311,7 +1311,7 @@
# Weekly ZFS pool health and memory diagnostic report — informational only.
ZFS_REPORT_LOG="/var/log/zfs-weekly-health.log"
ZFS_REPORT_ARC_WARN_PCT=90 # warn if ARC using more than this % of its max
ZFS_REPORT_FREE_WARN_GB=10 # warn if less than this GB free RAM
ZFS_REPORT_ARC_FREE_WARN_GB=10 # warn if ARC headroom (max - current) drops below this GB
ZFS_REPORT_AVAIL_WARN_GB=20 # warn if less than this GB available on ZFS pool
ZFS_REPORT_DOCKER_TOP=10 # how many top Docker containers to show by memory
# Pool ignore list defined per host in host*.conf — pool names are server-specific: