IBM DS4700 manual Cru

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

Problem
indicator	Component	Possible cause	Possible solutions
Amber LED is lit	Front panel	General machine	A Fault LED is lit somewhere on
(continued)	(Global	fault	the storage subsystem (check for
			Amber LEDs on CRUs).
	Summary Fault
		General machine	Open the DS4700 Express
	LED)
		fault (continued)	Storage Subsystem Management
			window and click on the
			Recovery Guru to see problems
			in the DS4700 Express
			configuration.
			Some errors will cause the
			Global Summary Fault LED to be
			lit but will not cause any
			individual CRU Fault LEDs to be
			lit. (Drive PFA exceeded or
			nominal temperature exceeded
			errors are a few examples.)
			Follow the corrective actions in
			the Recovery Guru window.
		Fibre-channel	Check that the CRUs are
		connection failure	properly installed. If none of the
			amber LEDs are lit on any of the
			CRUs, this indicates an SFP
			module transmission fault in the
			storage subsystem. Replace the
			failed SFP module. See the
			DS4000 Storage Manager
			software documentation for more
			information.
	Battery unit	Battery unit failure	Verify the failure using DS4000
	fault		Storage Manager Client and
			replace the failing battery.
Amber LED is lit	Power supply	The power switch is	Replace the failed power supply
and green LED is	CRU	turned off or there is	or turn on all power supply
off		an ac power failure.	switches.
Amber and green	Power supply	Power supply failure	Replace the failed power supply.
LEDs are lit	CRU
		Operating	Cool down the environment.
	(Fault and	environment is too
		hot
	Power LEDs lit;
	SAA lit; Direct	Fan failure	Replace the power supply and
	Current Enable		fan unit CRU
	LED is not lit)
All amber and	All drive CRUs	The DS4700 Express controllers are going through
green LEDs are		start-of-day process (booting up). Wait up to five
slowly flashing		minutes for the controllers to complete the booting
		process. If the drive Activity LEDs are not steady lit or
		momentarily flicker, and the amber LEDs are unlit after
		waiting more than six minutes, contact IBM support.

Chapter 6. Hardware maintenance 185