Improved scrubbing for TrueNAS

TrueNAS-iSCRUB.md

Improved SCRUB handling at TrueNAS.

Tested at TrueNAS CORE 12.0-U7, but it should be compatible with TrueNAS SCALE too.

Tunables

Not required, but recommended: vfs.zfs.scan_legacy=1

Init/Shutdown Scripts

• Type: Script
• Script: .../zpool-scrub-resume
• When: Post Init

• Type: Script
• Script: .../zpool-scrub-pause
• When: Shutdown

zpool-scrub-pause

#!/bin/sh
zpool list -H -o health,name 2>&1 \
| awk -F'\t' '$1 == "ONLINE" {print $2}' \
| while read -r pool
do
	zpool status "$pool" \
	| grep -Fq "scrub in progress" \
	&& zpool scrub -p "$pool"
done

zpool-scrub-resume

#!/bin/sh
zpool list -H -o health,name 2>&1 \
| awk -F'\t' '$1 == "ONLINE" {print $2}' \
| while read -r pool
do
	zpool status "$pool" \
	| grep -Fq "scrub paused" \
	&& zpool scrub "$pool"
done