lvmchk

#!/usr/bin/awk -f
#
# lvmchk
#   - checks all lvm volumes for thin data/metadata usage
#   - prints volume name if exceeds threshold
#   - run in cron job to mail when thin pool out-of-space approaches
#
# scott@smemsh.net
# https://github.com/smemsh/utiladm/
# https://spdx.org/licenses/GPL-2.0
#

BEGIN {
	threshold = 85 # alert when exceeding this percentage used

	fields[1] = "lv_full_name"
	fields[2] = "data_percent"
	fields[3] = "metadata_percent"

	options = ""
	nfields = length(fields)
	for (i = 1; i <= nfields; i++) {
		options = sprintf("%s%s", options, fields[i])
		if (i < nfields) options = options ","
	}

	lvscmd = "lvs" \
		" --noheadings" \
		" --all " \
		" --separator=' '" \
		" --options=" options \
	;

	while (lvscmd | getline)
		for (i = 2; i <= 3; i++)
			if ($i > threshold)
				printf("volume %s exceeds %u%% %s (%2.2f%%)\n",
					$1, threshold, fields[i], $i)
}