list the ZFS datasets on a host and send graphite data on how full each one is.

zfs-to-graphite

#!/opt/csw/bin/ruby
#
#
require 'socket'

def normalize_size(size)
   multiples={'K' => (1024),
              'M' => (1024 * 1024),
              'G' => (1024 * 1024 * 1024),
              'T' => (1024 * 1024 *1024 *1024)
             }
   if size.match /([0-9\.]+)([GMKT])?/
        multiplier = multiples[$2].to_i
        if (multiplier == 0) then
                multiplier =1
        end
        amount = $1.to_f
        return  (amount * multiplier).to_f
   else
        raise("can't parse size " + size)
   end
end

graphite_host='your-graphite-server-here'
graphite_port=2003
s = TCPSocket.open(graphite_host, graphite_port)

host=`hostname`.chomp.gsub(/\./,'-');
prefix="servers.#{host}.zfs."

now=Time.now().to_i
zfs_state=`/usr/sbin/zfs list -H -t filesystem -o name,available,used`
overfull = []
zfs_state.each_line do |line|
   parts = line.split(/\t/)
   used = normalize_size(parts[2])
   size = normalize_size(parts[1]) + used
   pcfree = ((1 - (used.to_f / size.to_f )) * 100).to_i
   path=parts[0].gsub(/\//,'-')
   s.puts( "#{prefix}#{path} #{used}  #{now}")
end
s.close