spindown_harddrives.sh

for i in 1 2 3 4 5; do

  pool_mnt='/tanka /sftponly/*/tanka'
  pool_name='tanka'

  handle_count="$(lsof $pool_mnt  | grep -v '  cwd  ' | grep -v ^COMMAND | wc -l)"

  if [ "$handle_count" -ne 0 ]; then
    rm -f /tmp/spindown_harddrives.marker*
    exit 0
  fi

  unset handle_count

  zfs_processes="$(ps aux | grep 'zfs' | grep -v 'grep zfs' | wc -l)"

  if [ "$zfs_processes" -ne 0 ]; then
    rm -f /tmp/spindown_harddrives.marker*
    exit 0
  fi

  unset zfs_processes

  if [ "$(zpool status -x $pool_name)" != "pool '$pool_name' is healthy" ]; then
    rm -f /tmp/spindown_harddrives.marker*

    exit 0
  else
    if [ -f /tmp/spindown_harddrives.marker0 ]; then
     if [ -f /tmp/spindown_harddrives.marker1 ]; then
      if [ -f /tmp/spindown_harddrives.marker2 ]; then
       if [ -f /tmp/spindown_harddrives.marker3 ]; then
        if [ -f /tmp/spindown_harddrives.marker4 ]; then
         if [ -f /tmp/spindown_harddrives.marker5 ]; then
          if [ -f /tmp/spindown_harddrives.marker6 ]; then
           if [ -f /tmp/spindown_harddrives.marker7 ]; then
            if [ -f /tmp/spindown_harddrives.marker8 ]; then
             if [ -f /tmp/spindown_harddrives.marker9 ]; then
              if [ -f /tmp/spindown_harddrives.marker10 ]; then
	       ( hdparm -y /dev/sd[a-z] ) > /dev/null 2>&1
               rm -f /tmp/spindown_harddrives.marker*
               exit 0
              else touch /tmp/spindown_harddrives.marker10; fi
             else touch /tmp/spindown_harddrives.marker9; fi
            else touch /tmp/spindown_harddrives.marker8; fi
           else touch /tmp/spindown_harddrives.marker7; fi
          else touch /tmp/spindown_harddrives.marker6; fi
         else touch /tmp/spindown_harddrives.marker5; fi
        else touch /tmp/spindown_harddrives.marker4; fi
       else touch /tmp/spindown_harddrives.marker3; fi
      else touch /tmp/spindown_harddrives.marker2; fi
     else touch /tmp/spindown_harddrives.marker1; fi
    else touch /tmp/spindown_harddrives.marker0; fi
  fi
  sleep 12
done