find-emptiest-drive

#!/bin/bash

MOUNT_PREFIX="/media/myarray"   # Set this to the directory where all your farm disks (HDD) are mounted
DISK_PREFIX="ChiaArray"         # All your disks should be called xxxx0 xxxx1 xxxx2 - this is the xxxx part

df -k  | grep -F "${DISK_PREFIX}" | awk '{print $5, $6}' | sort -n | head -1 | awk '{print $2}'