mrcharles
04b85e9935
ZFS is unused on the fleet (zero pools). Blacklisted module + disabled zfs service family + initramfs bake-in; ARC reclaimed live (tsys5 ~9G, tsys6 ~13G, tsys7 ~16G, tsys1 ~3G). Guard aborts on zfs-rooted hosts. Ticket: https://projects.knownelement.com/issues/737
56 lines
2.0 KiB
Bash
56 lines
2.0 KiB
Bash
#!/bin/bash
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# blacklist-zfs.sh — ZFS is unused on the tsys Proxmox hosts (zero pools):
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# keep the module and its service family out of RAM and out of boot. [#737]
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# Run ON a Proxmox host: tests/remote.sh prox-file proxmox/perf/scripts/blacklist-zfs.sh
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# Reversible: rm /etc/modprobe.d/blacklist-zfs.conf && systemctl enable zfs.target zfs-zed ...
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set -u
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log() { echo "[zfs-blacklist] $*"; }
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# Guard: never touch a host whose root filesystem is ZFS.
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root_fs=$(findmnt -n -o FSTYPE / 2>/dev/null)
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case "$root_fs" in
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*zfs*) log "ABORT: root fs is '$root_fs' — this host needs ZFS at boot"; exit 1 ;;
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esac
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conf=/etc/modprobe.d/blacklist-zfs.conf
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if [ ! -f "$conf" ]; then
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{
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echo "# ZFS unused on this host (no pools) — keep module out of RAM and boot [#737]"
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echo "blacklist zfs"
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} > "$conf"
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log "wrote $conf"
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else
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log "blacklist already present"
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fi
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# Stop + disable the zfs service family (zed holds the module open; the
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# import/mount/share units would fail or reload the module every boot).
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systemctl disable --now \
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zfs-zed.service zfs-import-cache.service zfs-import-scan.service \
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zfs-import.target zfs-mount.service zfs-share.service \
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zfs-volume-wait.service zfs-volumes.target zfs.target >/dev/null 2>&1
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log "zfs service family disabled"
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if lsmod | grep -q '^zfs'; then
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if modprobe -r zfs 2>/dev/null; then
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log "module unloaded (ARC reclaimed)"
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else
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log "WARNING: module still in use — will stay away after next reboot anyway"
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fi
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else
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log "module not loaded"
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fi
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# Bake the blacklist into the initramfs so early boot cannot load it either.
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if command -v update-initramfs >/dev/null 2>&1; then
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if update-initramfs -u -k all >/dev/null 2>&1; then
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log "initramfs updated"
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else
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log "WARNING: update-initramfs failed — blacklist applies from main boot only"
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fi
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fi
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state=$(systemctl is-enabled zfs-zed 2>/dev/null)
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log "done: root_fs=${root_fs:-?} zfs_zed=${state:-n/a} module=$(lsmod | grep -c '^zfs')"
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