Comment # 34 on bug 909111 from Mark Hounschell

I've added it. 

# Returns the list of existing targets per host
idlist ()
{
  local tmpid
  local newid
  local oldid

  oldlist=$(ls /sys/class/scsi_device/ | sed -n
"s/${host}:${channel}:\([0-9]*:[0-9]*\)/\1/p" | uniq)
  # Rescan LUN 0 to check if we found new targets
  echo "${channel} - -" > /sys/class/scsi_host/host${host}/scan

  udevadm_settle

  newlist=$(ls /sys/class/scsi_device/ | sed -n
"s/${host}:${channel}:\([0-9]*:[0-9]*\)/\1/p" | uniq)

It did not help though.