IBM DS4700 manual Sfp

Table 51. Symptom-to-FRU index (continued)

Problem
indicator	Component	Possible cause	Possible solutions
All green LEDs	All CRUs	Subsystem power is	Check that all storage subsystem
are off		off	power cables are plugged in and
			the power switches are on. If
			applicable, check that the main
			circuit breakers for the rack are
			powered on.
		AC power failure	Check the main circuit breaker
			and ac outlet.
		Power supply failure	Replace the power supply.
		Operating	Cool down the environment.
		environment is too
		hot
Amber LED is	Drive CRUs	Drive identity is in	No corrective action needed.
flashing	(Fault LED lit)	process
	RAID controller	An FC loop	Use the Read Link Status
	port bypass	initialization process	window in the Storage Manager
		(LIP) is being	Client Subsystem Management
		generated in the	window and the storage
		drive loop due to a	subsystem event logs to isolate
		faulty component.	the faulty component.
	Controller drive	The enclosure	Use the Recovery Guru menu
	port bypass	speed was set to 4	function in the Storage Manager
	LED	Gbps but the SFP	Client Subsystem Management
		inserted in the	window to verify the problem and
		controller drive SFP	replace the SFP with a 4 Gbps
		port does not	SFP.
		operate at 4 Gbps.
	General Fault	An intermittent	Use the Recovery Guru menu
	LED (located	failure in the	function in the Storage Manager
	on the front of	DS4700	Client Subsystem Management
	the storage	ExpressStorage	window to diagnose the problem.
	subsystem)	Subsystem
		configuration. The
		problem could be
		directly related to
		the hardware in the
		configuration (hard
		drive or bad cable)
		or indirectly related
		to the DS4700
		Express Storage
		Subsystem
		configuration (such
		as a fibre channel
		host bus adapter
		failure in the host
		server or the fibre
		channel switch in
		the SAN causing
		LUNs to be on a
		non-preferred path.)

186IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide