# zpool list
NAME      SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
tank  54.5T  36.0T  18.5T         -    35%    66%  1.00x  ONLINE  -

#!/bin/sh
#
STATUS=$(/sbin/zpool list | grep tank | grep ONLINE)
if [ $? -gt 0 ]; then
        echo "Problems"
        exit 1
else

echo all system go!
exit 0

fi