IBM Partner Pavilion DS4100 manual Hardware maintenance

Table 17. Symptom-to-FRU index (continued)

Problem
indicator	Component	Possible cause	Possible solutions
All green LEDs off	All CRUs	Subsystem	Check that all storage-server
		power is off	power cords are plugged in and
			the power switches are on. If
			applicable, check that the main
			circuit breakers for the rack
			cabinet are turned on.
		AC power failure	Check the main circuit breaker
			and ac outlet.
		Power supply	Replace the power supply.
		failure
		Midplane failure	Have the midplane replaced
			(service technician only).
Amber LED	Drive CRUs	Drive identify is in	No corrective action is needed.
flashing		process
One or more	Power supply	Power cord	Make sure that the power cord is
green LEDs off	CRUs	unplugged or	plugged in and the power-supply
		switches turned	switches are turned on.
		off
	All drive CRUs	Midplane failure	Have the midplane replaced
			(service technician only).
	Front panel	Power supply	Make sure that the cords are
		problem	plugged in and power supplies
			are turned on.
		Hardware failure	If any other LEDs are on, replace
			the midplane (service technician
			only).
	Battery	Battery failure	Replace the battery.
	Cache active	The cache is	Use the DS4000 Storage
		disabled	Manager client to enable the
			logical drive read and write cache
			settings.
		The cache	Replace the RAID controller.
		memory has
		failed
		The cache	Use the DS4000 Storage
		battery has failed	Manager client to check and
			replace the battery.
	Host loop	Host or switch is	Check if host or switch is on.
		off or has failed	Replace attached devices that
			have failed.
		Fibre-channel	Ensure that the fibre-channel
		cable has failed	cables are undamaged and
			properly connected.
		SFP has failed	Ensure SFP is seated properly;
			replace SFP.
		RAID controller	Ensure that the unit is powered
		has no power or	on. Replace RAID controller.
		has failed

Chapter 6. Hardware maintenance 113