What:		/sys/class/scsi_host/hostX/isci_id
  Date:		June 2011
  Contact:	Dave Jiang <dave.jiang@intel.com>
  Description:
  		This file contains the enumerated host ID for the Intel
  		SCU controller. The Intel(R) C600 Series Chipset SATA/SAS
  		Storage Control Unit embeds up to two 4-port controllers in
  		a single PCI device.  The controllers are enumerated in order
  		which usually means the lowest number scsi_host corresponds
  		with the first controller, but this association is not
  		guaranteed.  The 'isci_id' attribute unambiguously identifies
  		the controller index: '0' for the first controller,
  		'1' for the second.